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Bake Sale Strategies: Why They Work worksheet preview

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Bake Sale Strategies: Why They Work

Grade 2 bake sale worksheet. Students use place value and properties of addition to explain why addition and subtraction strategies work.

Grade 2MathInteractive · Printable

Aligned to2.NBT.B.9

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What’s included

  • Single worksheet
  • Auto-graded online
  • 1 Common Core standard
  • Printable answer key
  • 12 questions
  • Classroom-ready

Details

Format
Interactive · Printable
Grade
Grade 2
Subject
Math
Question types
Fill in the blank, Multiple choice, Matching, Circle the answer, Sorting, Short answer

About this worksheet

What students practice

  • Students explain why adding tens and ones separately gives the correct sum.
  • Students use the order and grouping properties to explain why a total stays the same.
  • Students find and explain mistakes in place value subtraction within 100.

How to use

Model the first section with base-ten blocks, then let students work on their own. Have students read their written explanations aloud and compare strategies with a partner.

Curriculum

Common Core standard covered

2.NBT.B.9

Explain why addition and subtraction strategies work.

Preview

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Name Date

Bake Sale Strategies: Why They Work

Use tens, ones, and friendly numbers to show why each strategy is right.

Tens and ones

Break each number into tens and ones. Fill in the blanks.

1.

Ava's class baked 34 blueberry muffins and 25 banana muffins. Ava adds the tens, then the ones.

Tens: 30 + 20 =  
Ones: 4 + 5 =  
So 34 + 25 =   muffins

2.
Leo adds 47 + 36 the same way. He splits 47 into 40 + 7 and 36 into 30 + 6.

Tens: 40 + 30 =  
Ones: 7 + 6 =  
So 47 + 36 =  

3.
Why does Leo's way give the same total as 47 + 36?
  • A. He left out the ones to make the problem easier.
  • B. He added all the same tens and ones, just in a different order.
  • C. He rounded both numbers up to the next ten.

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