Group Three Addends into an Easier Sum

Supplied materials

• Paper and a pencil; drawing and spoken explanations are welcome. An adult may read directions and options aloud.
• Supplied worked-case record: For 4+7+6, pair four with six to make ten.
• All quantities and shape descriptions are supplied in the worked example and questions; no purchase or personal information is needed.

Learn the idea

Three amounts can be grouped in a useful order because their total does not depend on which pair is added first. Look for two amounts that make ten. Add the remaining amount afterward, while keeping all three original parts in the calculation.

Find a pair of supplied addends that makes ten. Circle that pair, calculate it, then add the remaining addend. Check each original amount appears exactly once in your reorganized expression.

Circle the two parts that make ten. Changing the grouping must not lose or repeat an addend. Write the three amounts on cards so the ten-making pair can be moved together.

1. Write the three amounts on cards so the ten-making pair can be moved together.
2. Follow the worked example. Point to each number or shape feature and say what it tells you.
3. Find a pair of supplied addends that makes ten.
4. Try the question and then the three practice questions. Check your answers and explain any change you make.

Check your reasoning

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Take it further

Find 3+8+7. Expected: 3+7+8=18.

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