Students use a place marker on the hundreds board. They place it on the starting number, follow the arrows, and write the answer. They will learn that down arrows represent 10 and arrows to the right represent adding one. This can be taught with the same concepts as base ten blocks. It gives students the concrete knowledge of adding two-digit numbers. When they are ready, they can complete the corresponding worksheet that asks them to write their starting number, how many they added (the arrows), and the sum.