Encoding and Decoding
470+ results
Filters
Grade
Subject
Format
Resource type
Standard
Theme
Language
Programs & methods
Supports
Simon Says Multiplication! Message #1 - Decode the Secret Message
Simon is a Sleuth Sloth who loves following clues and playing Simon Says! This cute activity is perfect for getting students excited about math. Students work to solve single-digit multiplication problems to decode Simon’s secret message. The entire class or just a small group will delight in the silly antics of the game while getting multiplication fact practice!How It Helps Students:Builds math fluency with puzzles and problem-solvingBoosts logic, reasoning, and real-world thinkingEngages stud
3rd - 5th
Arithmetic, Basic Operations, Other (Math)
CCSS
3.NBT.A.3
, 3.OA.A.1
, 3.OA.A.4
+3
Addition to 1,000 Joke Code Crackers - 20 worksheets - Fast Finisher Puzzle Fun
Make long addition practice exciting with our Code Cracker Riddle Worksheets! As students solve addition problems, they unlock mystery letters to decode a fun riddle at the end. This engaging twist turns math practice into a puzzle-solving adventure, keeping learners motivated while reinforcing essential skills. Perfect for classrooms, homework, and extra practice—because math should be as fun as it is educational! ✅ Give your fast finishers something fun to do while they practice long addi
2nd - 5th
Arithmetic, Basic Operations, Mental Math
Addition within 1000 with Regrouping | Thanksgiving | Cryptogram
Are you looking for a no prep alternative assessment activity or extra practice for 3rd grade horizontal addition within 1000? With these engaging cryptogram worksheets, students will practice targeted math skills by solving equations and filling out the mystery message or joke! This quiz alternative will appeal to all students, including homeschool, general ed, and gifted and talented students. All problems in these puzzles are presented horizontally which most students find more difficult th
3rd
Arithmetic, Math
CCSS
3.NBT.A.2
Multiplication and Division CSI Math Mystery Back To School Activities Teacher
Are you looking for a fun Detective CSI Math Mystery to engage your students in multiplication and division? Then these math activities are for you. Designed to be used at any time during the year, but perfect for an end-of-the-year worksheet and a back-to-school activity at the stat of the school year. Capture your students' attention with this fun CSI Math Mystery activity by guiding them to solve math problems and puzzles. Students narrow down the possible options by completing the activit
3rd - 8th
Arithmetic, Basic Operations, Math
CCSS
3.OA.A.1
, 3.OA.A.3
, 3.OA.A.4
+2
Winter Multiplication and Division CSI Math Mystery Christmas Activities & Games
Looking for a fun and engaging way to review multiplication and division facts this December? This printable Christmas and Winter CSI Math Mystery is perfect for 3rd grade, 4th grade, 5th grade, and 6th grade math students who need extra practice with their 12 times tables. Designed as a festive math mystery game, it's ideal for winter math centers, holiday enrichment, and December review. Students solve a series of multiplication and division problems, cross off suspects, and work to solv
3rd - 6th
Arithmetic, Basic Operations, Other (Math)
CCSS
3.OA.A.1
, 3.OA.A.3
, 3.OA.A.4
+2
Thanksgiving Multiplication and Division CSI Math Mystery | Missing Pumpkin Pie
Fall Math Mystery • Thanksgiving Math Activity • Multiplication & Division Review Looking for a fun and seasonal fall math mystery to engage your students in meaningful practice? The Missing Pumpkin Pie is a Thanksgiving CSI Math Mystery packed with multiplication and division puzzles perfect for October, November, or December math lessons. Designed for 3rd grade, 4th grade, 5th grade, and 6th grade, this printable escape room–style mystery brings a festive twist to your math block. Studen
3rd - 6th
Arithmetic, Basic Operations, Math Test Prep
CCSS
3.OA.A.1
, 3.OA.A.3
, 3.OA.A.4
+2
CSI Math Mystery Thanksgiving Activities with Turkey Addition and Subtraction
Looking for a Thanksgiving math mystery to review addition, subtraction, multiplication, and division? This fun and engaging printable PDF is designed for 2nd grade, 3rd grade, 4th grade, and 5th grade students. With a Thanksgiving theme and a missing turkey to solve, students work through a variety of mixed-operation math activities to uncover clues and eliminate suspects—until they solve the mystery! This print-and-go Thanksgiving math game is perfect for fall review, early finishers, math c
2nd - 5th
Arithmetic, Basic Operations, Other (Math)
Math Puzzles Addition | Magic Squares and Triangles 3 x 3 SET 1
These addition logic puzzles feature 3 x 3 Magic Squares and Magic Triangles and will have your students doing some serious math, while having fun with the math puzzles at the same time. Win-win! These are challenging and provide for lots of logical thinking. I've used these puzzles with students in Grades 1 - 5, and they're always fun. Laminate these cards (or put them inside a plastic sleeve) and allow your students to write on them so they can erase often and try again. Or, give students num
1st - 5th
Arithmetic, Math, Mental Math
CCSS
1.OA.A.2
, 1.OA.C.6
, 1.OA.D.8
+1
Pancake Day CSI Math Mystery with The Half Eaten Pancake Shrove Tuesday & Lent
A CSI math investigation for Pancake Day. It is the perfect activity for Shrove Tuesday or otherwise known as Pancake Day and Lent, but can be used all year round. This activity will engage students by taking them on a journey to solve 10, 100, or 1000 addition and subtraction puzzles and problems. Students narrow down the suspects by completing the activities and marking them off from the suspect list until one person is left. Who ate the pancake? Answer sheets are included Enjoy and please rem
3rd - 7th
Arithmetic, Basic Operations
3RD GRADE ADDITION & SUBTRACTION: 8 Skills-Boosting Practice Worksheets
Students will add & subtract multi-digit numbers (within 1000) & solve word problems with ease! Use these scaffolded math drills to teach and reinforce the fundamentals, or prep for test day. Need to teach students how to find an unknown number using subtraction? This unit covers it, plus regrouping/borrowing and using common addition & subtraction keywords to solve word problems! Each printable begins with a mini-lesson followed by several Common Core designed, simulated test questions (i
3rd - 5th
Arithmetic, Basic Operations, Math Test Prep
CCSS
3.NBT.A.2
CSI Math Mystery 3rd 4th 5th Grade Bundle Time, Roman Numerals & Multiplication
CSI Math Mystery Bundle. Bring excitement to your classroom with this CSI Math Mystery Bundle! Designed for 3rd grade, 4th grade, and 5th grade students, these detective-style math activities transform ordinary worksheets into fun problem-solving cases. Students become detectives, solving puzzles and eliminating suspects until the final culprit is revealed. What is a CSI Math Mystery? A CSI Math Mystery is a detective-themed activity where students solve math problems and puzzles to uncover c
3rd - 6th
Arithmetic, Numbers, Telling Time
2 Digit Addition and Subtraction With Regrouping Worksheets, Word Problems, Quiz
This 47-page 2 Digit Addition and Subtraction Unit (with a complete 47-page answer key) offers scaffolded worksheets to support students as they learn about 2 digit addition and subtraction without and with regrouping. The worksheets offer a variety of o ptions for instruction and practice, as well as word problems and quizzes. This package contains the following pages:- 38 worksheets to support students as they develop their understanding and confidence when adding and subtracting 2-digit
1st - 4th
Arithmetic, Basic Operations, Math
Also included in: 2 and 3 Digit Addition and Subtraction Regrouping SCAFFOLDED BUNDLE
Multi-Digit Place Value Critical Thinking Math Riddles 3-Digit & 4-Digit Numbers
This bundle of 150 multi-digit place value math riddle card activities for 3-digit and 4-digit numbers makes it fun and easy to promote mental math skills and critical thinking! Differentiate for learners in 2nd, 3rd, 4th, & 5th grades! Here's what's included in this bundle for hundreds and thousands:✅ Two sets for high second grade, third grade, and fourth grade (100 cards in total) ✅ A set for fourth and fifth grade (50 cards) The range of difficulty will allow you to easily differentiat
2nd - 4th
Arithmetic, Mental Math, Place Value
CCSS
2.NBT.A.1
, 3.NBT.A.1
, 4.NBT.A.2
+4
3 Digit Addition and Subtraction With Regrouping Worksheets, Word Problems, Quiz
This 92-page 3 Digit Addition and Subtraction Unit (with a complete 92-page answer key) offers scaffolded worksheets to support students as they learn about 3 digit addition and subtraction without and with regrouping. The worksheets offer a variety of options for instruction and practice, as well as word problems and quizzes. This package contains the following pages:- 83 worksheets to support students as they develop their understanding and confidence when adding and subtracting 3-digit nu
2nd - 4th
Arithmetic, Basic Operations, Math
Also included in: 2 and 3 Digit Addition and Subtraction Regrouping SCAFFOLDED BUNDLE
Easter Math Mystery with Addition and Subtraction Easter Egg Hunt CSI Worksheets
This Easter Math Mystery activity with addition and subtraction with regrouping worksheets will engage students by taking them on a journey to solve and investigate a CSI Easter math crime. In these Easter activities and problems, students narrow down the suspects by completing the activities and worksheets, marking them off from the suspect list until one person is left. Easter and Spring fun. This case includes3 Digit addition and subtraction with regroupingSkip counting by 10 with numbers up
3rd - 7th
Arithmetic, Basic Operations
Break apart addition strategy worksheets - split the hundreds tens and ones
Break apart addition strategy worksheets - split the hundreds tens and ones - Expanded Form Standard Form This is a set of 24 Break Apart Addition Strategy Worksheets that a designed to help students become more confident adding two and three digiti numbers together. This is a great way to teach the concept on Expanded Form, Standard Form to students. All worksheets are clearly laid out and are all black and white no prep printables, so you should be able to just print and go. See below for more
1st - 3rd
Arithmetic, Basic Operations, Math
CCSS
2.NBT.A.1
, 2.NBT.A.1a
, 2.NBT.A.1b
+7
4th Grade Math SBAC Test Prep: Worksheets & Practice - Digital & Printable
These 4th Grade Math Review Worksheets are specifically designed for Smarter Balanced Assessments (SBAC) test prep, available in both printable PDF and interactive Google Slides formats. Boost student scores with over 80 practice questions covering key math concepts: Measurement and Data, Operations and Algebraic Thinking, Numbers and Operations, and Geometry. This valuable resource is perfect for math intervention, comprehensive review, homework, and early finishers. It's also an exc
3rd - 5th
Arithmetic, Basic Operations, Math Test Prep
CCSS
4.MD.A.1
, 4.MD.A.2
, 4.MD.A.3
+27
Multiplication and Division CSI Detective Math Mystery Fun The Missing Medallion
Looking for an engaging way to practice multiplication and division facts? “ The Missing Medallion” is a museum-themed CSI Math Mystery that challenges your 3rd grade, 4th grade, 5th grade, or 6th grade students to solve puzzles, crack clues, and build math fluency — all while solving a crime! This fun and rigorous escape room-style worksheet activity includes multiplication and division problems up to 12 × 12. As students work through each math task, they eliminate suspects and get closer t
3rd - 6th
Arithmetic, Basic Operations, Mental Math
CCSS
3.OA.A.1
, 3.OA.A.3
, 3.OA.A.4
+2
End of Year Summer Math Review Puzzle - Cut & Glue
EOY Math Review/Summer School Math Puzzle | Mystery Picture BUNDLEMake EOY Review/summer school math fun and purposeful with this engaging Mystery Picture Math Puzzle Bundle! This resource includes a collection of print-and-go math worksheets designed to help students practice key skills while revealing a fun mystery picture. Each puzzle targets essential math concepts through a hands-on, cut-and-paste activity that builds accuracy, focus, and excitement for learning! What's Included: ✔️ 3 D
2nd - 4th
Arithmetic, Basic Operations, Place Value
CCSS
2.NBT.B.5
, 2.NBT.B.7
, 3.NBT.A.2
+6
Complete Soroban Curriculum Bundle | Levels 1-4 | Master Mental Math & Abacus
Transform your students into mental math wizards! This comprehensive 4-level curriculum takes students from holding an abacus for the first time to mastering complex multi-digit addition and subtraction using the Japanese Soroban method. Perfect for STEM classrooms, homeschooling, and after-school math clubs. What’s Included in this Bundle?This bundle combines our top-rated levels into one seamless learning journey: Level 1: The Foundation – Introduction to the Soroban, bead values, and simple a
K - 12th
Arithmetic, Mental Math
CCSS
1.NBT.C.4
, 2.NBT.B.5
, 3.G.A.2
+1
K-12 Math Special Education Task Cards- Laminate and Reuse daily
20 Math EC Task Boxes – 102 Pages of Hands-On Learning for Special Education & Early Learners! This resource includes 102 engaging, hands-on math task boxes designed for Early Childhood, Special Education, and Autism classrooms. Each activity targets essential foundational math skills through visuals, manipulatives, and simple, structured tasks that promote independence and success. Skills Included: Number Identification Counting Objects Grouping & Sets Tallies Addition & Subtraction Multi
PreK - 12th
Arithmetic, Basic Operations, Measurement
Addition Boxes - 2 Digit, 3 Digit and 4 Digit Numbers
This is an updated 9 page PDF file: 2 digit + 2 digit numbers; 2 digit + 1 digit numbers; 3 digit + 3 digit numbers; 3 digit + 2 digit numbers; 3 digit + 1 digit numbers; 4 digit + 4 digit numbers, 4 digit + 3 digit numbers; 4 digit + 2 digit numbers and 4 digit + 1 digit numbers. Please feel free to send in requests for updates to this lesson. I'm happy to accommodate if possible. Originally created for Montessori students, but this can be used with any student learning addition.
1st - 3rd
Arithmetic
2-Digit Addition & Subtraction Spring Math Worksheets for 1st & 2nd Grade
🌸 Looking for a complete 2-digit addition and subtraction solution this spring?This Spring Math Bundle includes 2-digit addition and subtraction worksheets with & without regrouping, and comes with a bonus interactive online game, designed to build strong place value understanding and fix the most common regrouping mistakes. Students don’t just memorize steps—they learn why regrouping works using visual models, Making 10 strategies, breaking apart numbers, and clear regrouping language. Ski
1st - 3rd
Arithmetic, Basic Operations, Place Value
CCSS
1.NBT.B.2
, 1.NBT.B.2a
, 1.NBT.B.2b
+3
Missing Digits 3 Digit Addition and Subtraction Worksheets 3rd & 4th Grade Math
These three digit addition and subtraction worksheets have missing digits for students to figure out. This bundle includes addition and subtraction problems with and without regrouping. Students will use the relationship between addition and subtraction to solve for the missing or unknown digits. These worksheets are perfect for independent work, small groups, enrichment, or a whole class lesson! Great for 3rd, 4th, or 5th grade! This resource includes:20 Worksheets (5 each product)20 Answer Key
2nd - 5th
Arithmetic, Basic Operations, Other (Math)
CCSS
3.NBT.A.2
, 4.NBT.B.4
Showing 1-24 of 470+ results
TPT is the largest marketplace for PreK-12 resources, powered by a community of educators.
IXL family of brands