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Application problems of addition and subtraction in second grade mathematics
Xiaolan is seven years younger than Xiaoming.

Xiaoming has 14 stars, Xiaolan has 7 stars, and 14 minus 7 equals 7, so Xiaolan has 7 fewer stars than Xiaoming.

This is a math application problem in the second volume of the second grade of primary school, which mainly examines students' ability to master the knowledge of "addition and subtraction".