Adding is just as easy as subtracting. The decimals really don't change much.
3.58 4.13 + 1.63 + 3.22 -------- -------- 5.21 7.35 4.11 4.68 + 3.25 + 2.34 -------- -------- 7.36 7.02
Now you get to try a few for yourself.
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