Decimals: Adding, Subtracting & Ordering to Thousandths ~ Crack the Code activities are fun and engaging ways for students (grades 5-7) to get computation practice with decimals. They’ll enjoy the challenge and feedback is immediate through solving the puzzles (quotes from The Phantom Tollbooth) correctly.

This Crack the Code resource has two different puzzles, each with three parts.

First, students must successfully solve the problems. The second puzzle has a mix of addition and missing addend problems for an extra challenge.

Next, they must place their answers in order from least to greatest and greatest to least (second puzzle), thus making the alphabet a number line from A to Z .

Finally, students find the corresponding numbers in the code and place that number’s letter in the blank.

This is an excellent challenge for students who breeze through your regular computation practice, as well as a great buddy-problem.

Built-in problem-solving challenges include computation errors, and ordering the decimals incorrectly. If they make a computation error, it can throw off ordering the decimals correctly and cause problems in cracking the code. Or, maybe they get all the computation correct, but they’re off in ordering the decimals. Their challenge will be finding a way to track down their errors, make their corrections and successfully Crack the Code.

Included in this resource are 2 different puzzles with:

♦ Addition with decimals up to thousandths

♦ Missing addends

♦ Understanding decimal place value

♦ Ordering decimals

♦ Teaching Notes and Answer Key

♦ 24 problems, student copies in BW

♦ Aligns with CCSS

Ways to use Crack the Code puzzles~

• Centers
• Go-to Activities
• Fun Class Challenge
• Small Group Challenges
• Paired Work (Buddy up!)
• Test Prep
• Homework
• Sub Days
• RTI

Quotes:

“Never feel badly about making mistakes, as long as you take the trouble to learn from them.” Princess of Pure Reason

Milo: I didn't know I was going to eat my words. King Azaz: Of course you didn't. That's what we're all doing. You should have made a tastier speech.

~Norton Juster, The Phantom Tollbooth

★ This resource is part of the Phantom Tollbooth Bundle.

Click HERE for additional Crack the Code puzzles.

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