Each colored set of place-value blocks represents a decimal. Which explains how to find the sum of the decimals? Blue blocks showing 4 stacks of ten blocks and 4 single blocks and red blocks showing 8 stacks of ten blocks and 7 single blocks.

A. Count 40 squares, or 0.40, in the first set and 80 squares, or 0.80, in the second set. Then add them to get 1.20.

B. Count 44 squares, or 0.44, in the first set and 87 squares, or 0.87, in the second set. Then add them to get 1.31.

C .Count 56 squares, or 0.56, in the first set and 13 squares, or 0.13, in the second set. Then add them to get 0.69.

D. Count 50 squares, or 0.50, in the first set and 90 squares, or 0.90, in the second set. Then add them to get 1.40.
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