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Neighborhood Recycling Center: Make the Math Make Sense worksheet preview

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Neighborhood Recycling Center: Make the Math Make Sense

Explain addition and subtraction strategies using recycling-center counts, place-value blocks, trades, and mistake analysis.

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
  • 14 questions
  • Classroom-ready

Details

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

About this worksheet

What students practice

  • Students use place value and addition properties to explain addition strategies.
  • Students explain subtraction strategies using trades, counting up, and related addition.
  • Students identify and explain mistakes in addition and subtraction strategies.

How to use

Discuss one block model together, then have students complete the sheet independently or with a partner. Ask students to explain why each trade or change keeps the math correct.

Curriculum

Common Core standard covered

2.NBT.B.9

Explain why addition and subtraction strategies work.

Preview

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Name Date

Neighborhood Recycling Center: Make the Math Make Sense

Explain the helpers’ strategies for counting cans and bottles.

Combine the Collections

The neighborhood recycling center collects cans and bottles. Complete the strategies and explain why they work.

1.
Nia combines 47 cans from one bin with 36 cans from another. These blocks show the two counts.
First bin:Second bin:

Before trading, there are   tens and   ones.
Trading 10 ones for 1 ten keeps the value the same.
47 + 36 =   cans.

2.
Omar combines 126 bottles and 152 bottles. He writes 100 + 100 + 20 + 50 + 6 + 2. Why does this give the same total as 126 + 152?
  • A. Each digit keeps its value no matter where it is written.
  • B. He can leave out the ones because both counts have hundreds.
  • C. He breaks each count into hundreds, tens, and ones and includes every part.
  • D. He changes both counts to the nearest hundred before adding.
3.
Lena needs to find 68 + 27 cans. She moves 2 cans from the group of 27 to the group of 68. Now she adds 70 + 25. Why does her strategy work?
  • A. One group gains 2 and the other loses 2, so the total stays the same.
  • B. Both groups gain 2, so the total stays the same.
  • C. Changing 68 to 70 never changes an addition answer.
  • D. She removes 2 cans from the whole collection.

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