In teaching number sense it is important to provide instruction on friendly numbers. Sums of 10 are one type of friendly numbers that students love to rely on, when solving addition problems that feature multiple addends.
This document is intended to train students to identify two numbers that make ten, when presented with a string of addends. My students enjoy searching for the sums of ten, identifying the two addends that make ten, and then correctly coloring the sums of ten.
I tell my students that this activity 'trains their eyes' to find friendly numbers before attempting to solve!
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