The hundreds board implicitly uses rows of 10 and place value to help in adding two digit numbers.

In grade 3, I usually like students to be ‘weaned’ off this method of adding as it’s highly scaffolded. However, if they haven’t used this tool in grade 2 or a student needs extra support, a bit of work with this can be a lot of use.

When adding on the hundreds board, a move down one row adds on 10. For example, 32 + 10: | When adding on the hundreds board, a move across one column adds on 10. For example, 43 + 1: |

Once students understand this step, they can easily use the board for multidigit addition and subtraction.

An interested facet lets some students use different methods. For a question like **37 + 38**, a student can either:

move down 4 rows (+30) and then across 9 spots (+8). | move down 4 rows (+40), and then back up two spots (-2). |

Transparent bingo chips are a good tool for helping some students keep track of their steps. Laminated hundreds board that students write on with dry erase markers are also useful.

**Arrow math** replaces jumps of 10 and 1 with arrows. 37 ↓↓↓→→ is 37 + 10 +10 +10 +1 +1, or 37+32.

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