Make a Ten
Students need to make a ten when adding and subtracting. This prepares them for adding and subtracting bigger numbers.
When adding 42 + 9 they need to make a ten by adding one to the 9 ones. They get this one from the 2 ones in 42.
Research shows that using your fingers in math is key to better math performance. " In fact, the quality of the 6-year-old’s finger representation was a better predictor of future performance on math tests than their scores on tests of cognitive processing."
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