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Desert Rangers: Why Does the Strategy Work?

Grade 2 desert park worksheet: students use place value and properties of addition to explain why adding and subtracting 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, Sorting, Short answer

About this worksheet

What students practice

Students use place value to explain why adding tens and ones separately works.
Students explain why moving an amount between addends or counting up gives the right answer.
Students find and explain mistakes in addition and subtraction strategies.

How to use

Work through the first strategy together and talk about why it works before students try the rest. Encourage students to use the words tens and ones in every explanation.

Curriculum

Common Core standard covered

2.NBT.B.9

Explain why addition and subtraction strategies work.

Preview

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Desert Rangers: Why Does the Strategy Work?

Check the rangers' math as they count desert animals and supplies.

Adding strategies

The park rangers count desert animals. Finish each ranger's strategy, then choose why it works.

Ranger Ana saw 46 cactus wrens and 38 quail. She adds the tens, then the ones, then puts them together.

40 + 30 =
6 + 8 =
70 + 14 =

Why can Ana add the tens and the ones separately?

A. Because the ones do not change the total.
B. Because 40 + 30 is the same as 46 + 38.
C. Because 46 is 4 tens and 6 ones and 38 is 3 tens and 8 ones, so she still adds every part.
D. Because you must always add the bigger number first.