addition and subtraction within 100
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How many more shells did Xiao Hong pick up than Xiao Liang?
32-21=11(个)
Class 1 got 12 little red flags, while class 2 got 3 more than class 1. How many did the second class get?
12+3=15(面)
Two turtles lay eggs. The first one lays 86 eggs and the second one lays 9 more than the first one. How many eggs did the second turtle lay?
86+9=95(个)
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