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Pumpkin Patch Math Talk: Prove Your Strategy worksheet preview

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Pumpkin Patch Math Talk: Prove Your Strategy

Grade 2 pumpkin patch worksheet: explain why trading, counting up, and same-difference strategies work when adding and subtracting within 1,000.

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, Sorting, Short answer

About this worksheet

What students practice

  • Students explain why trading 10 ones for a ten or 1 hundred for 10 tens keeps a number the same.
  • Students explain why counting up and checking with addition work for subtraction within 1,000.
  • Students judge whether a strategy works and explain place value mistakes.

How to use

Work through the first section together with base-ten blocks. Then have students solve on their own and share their written explanations with a partner or in a class math talk.

Curriculum

Common Core standard covered

2.NBT.B.9

Explain why addition and subtraction strategies work.

Preview

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Name Date

Pumpkin Patch Math Talk: Prove Your Strategy

Show why trading, counting up, and same-difference moves give the right answer.

Trading blocks

Use hundreds, tens, and ones. Fill in the blanks and answer the questions.

1.

Farmer Rosa grew 158 small pumpkins and 126 big pumpkins. She adds them with blocks.

8 ones + 6 ones =   ones
14 ones = 1 ten and   ones
5 tens + 2 tens + 1 ten =   tens
158 + 126 =   pumpkins

2.
Why is it okay for Rosa to trade 10 ones for 1 ten?
  • A. Trading makes the total 10 more.
  • B. 10 ones and 1 ten are the same amount.
  • C. Ones are worth more than tens.
3.

The patch had 324 pumpkins. Families picked 152 of them. You cannot take 5 tens from 2 tens, so trade 1 hundred for 10 tens.

324 = 2 hundreds,   tens, 4 ones
324 − 152 =   pumpkins left

The preview shows the first questions. Unlock the worksheet to see all of it.

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