Why It Works Explaining Addition and Subtraction Worksheet
This why it works explaining addition and subtraction worksheet has 2nd graders jump by tens and ones on open number lines to add and subtract within 100. An answer key is included.
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About this resource
Description
The why it works explaining addition and subtraction worksheet helps second graders see the reason behind a mental math strategy instead of just memorizing steps. When children add or subtract two-digit numbers, they can break the second number into tens and ones, jump by the tens, and then jump by the ones. An open number line makes each of those jumps visible, so students can show exactly why their answer works.
On this worksheet, each problem comes with its own open number line. Students start at the first number, follow a printed jump for the tens, and write the number they land on. Next they follow the jump for the ones, write the new landing number, and copy the answer into the number sentence. Two problems use addition and two use subtraction, and every ones jump crosses a new ten, so children practice regrouping in a way they can actually see. Use it as guided practice after a mini-lesson, as a math center, or as homework that families can check together.
What’s Included
- One printable 2nd grade worksheet with four open number line problems
- Two addition and two subtraction problems within 100, all with regrouping
- Printed tens and ones jumps that model the strategy step by step
- A complete answer key with every landing number and final answer
Why This Worksheet Helps Kids
First, the why it works explaining addition and subtraction worksheet turns place value into a picture, so students understand that 56 + 37 is really 56 + 30 + 7. Second, jumping by tens builds fast, flexible mental math that children can use without paper. Third, writing each landing number lets students explain their thinking, which is exactly what second grade standards ask them to do.
Ideas for Teachers and Parents
Model the first problem aloud, then let students finish the rest with a partner and explain one jump to each other. Afterward, ask children to make up their own problem and draw the jumps on a blank line. This 2nd grade addition and subtraction worksheet also works well as a quick check before a unit test.
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