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Math puzzles in the second grade of primary school
1, because: calculation+calculation = calculation.

So: it counts as zero.

2, because of the marginal zone.

So: Edge = 1

3, because: look+think = 1 1

Look+think+1= 12

So: I want to be 2.

4. Because: look+think = 1 1

So: Look =9

Summary: If you regard it as 9, consider it as 2, and the side is 1, which is 0. The formula is: 990+220= 12 10.