Start Unknown Word Problems Worksheets | First Grade Math Word Problems

Description

Product Description

Make word problems make sense with this focused set of Start Unknown Word Problem Worksheets for 1st grade math! These no-prep printable worksheets help your students develop strong problem-solving skills by tackling real-world math situations where the starting number is missing. Easily decodable for student success.

Each page provides space to draw and encourages students to explain their thinking—perfect for guided practice, math centers, small groups, or independent work.

Whether you're teaching part-part-whole relationships or helping students build number sense and reasoning, these worksheets offer targeted support to master start unknown problem types.

✅ What’s Included:

10 worksheets with start unknown (addition)
10 worksheets with start unknown (subtraction)
15 worksheets mixed addition and subtraction
Visual aids (ten frames, organizer, space to draw)
Printable in black and white (ink-friendly!)

Skills Addressed:

Solving start unknown problems (e.g., ___ + 6 = 9)
Understanding part-part-whole relationships
Developing strategies to find missing addends
Explaining thinking with words and pictures

Aligned With Common Core Standards:

CCSS.MATH.CONTENT.1.OA.A.1: Use addition and subtraction within 20 to solve word problems involving situations of adding to, taking from, putting together, taking apart, and comparing.
CCSS.MATH.CONTENT.1.OA.D.8: Determine the unknown whole number in an addition or subtraction equation relating three whole numbers.

Perfect For:

Math Centers
Early Finishers
Intervention Groups
Homework
Guided Math

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Start Unknown Word Problems Worksheets | First Grade Math Word Problems

Name: Start Unknown Word Problems Worksheets | First Grade Math Word Problems
Brand: MrsCecisClassroomCorner
SKU: 14204597
Price: 6.00 USD
Availability: InStock

MrsCecisClassroomCorner

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$6.00

Highlights

Digital downloads

PDF

Grades

1st

Subjects

Basic Operations, Numbers, Other (Math)

Standards

CCSS1.OA.A.1

CCSS1.OA.C.6

CCSS1.OA.D.8

Description

Product Description

Each page provides space to draw and encourages students to explain their thinking—perfect for guided practice, math centers, small groups, or independent work.

Whether you're teaching part-part-whole relationships or helping students build number sense and reasoning, these worksheets offer targeted support to master start unknown problem types.

✅ What’s Included:

10 worksheets with start unknown (addition)
10 worksheets with start unknown (subtraction)
15 worksheets mixed addition and subtraction
Visual aids (ten frames, organizer, space to draw)
Printable in black and white (ink-friendly!)

Skills Addressed:

Solving start unknown problems (e.g., ___ + 6 = 9)
Understanding part-part-whole relationships
Developing strategies to find missing addends
Explaining thinking with words and pictures

Aligned With Common Core Standards:

CCSS.MATH.CONTENT.1.OA.A.1: Use addition and subtraction within 20 to solve word problems involving situations of adding to, taking from, putting together, taking apart, and comparing.
CCSS.MATH.CONTENT.1.OA.D.8: Determine the unknown whole number in an addition or subtraction equation relating three whole numbers.

Perfect For:

Math Centers
Early Finishers
Intervention Groups
Homework
Guided Math

Report this resource to TPT

Reported resources will be reviewed by our team. Report this resource to let us know if this resource violates TPT's content guidelines.

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Questions & Answers

Standards

to see state-specific standards (only available in the US).

CCSS1.OA.A.1

Use addition and subtraction within 20 to solve word problems involving situations of adding to, taking from, putting together, taking apart, and comparing, with unknowns in all positions, e.g., by using objects, drawings, and equations with a symbol for the unknown number to represent the problem.

CCSS1.OA.C.6

Add and subtract within 20, demonstrating fluency for addition and subtraction within 10. Use strategies such as counting on; making ten (e.g., 8 + 6 = 8 + 2 + 4 = 10 + 4 = 14); decomposing a number leading to a ten (e.g., 13 - 4 = 13 - 3 - 1 = 10 - 1 = 9); using the relationship between addition and subtraction (e.g., knowing that 8 + 4 = 12, one knows 12 - 8 = 4); and creating equivalent but easier or known sums (e.g., adding 6 + 7 by creating the known equivalent 6 + 6 + 1 = 12 + 1 = 13).

CCSS1.OA.D.8

Determine the unknown whole number in an addition or subtraction equation relating three whole numbers. For example, determine the unknown number that makes the equation true in each of the equations 8 + ? = 11, 5 = ▯ - 3, 6 + 6 = ▯.