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How to calculate simpler changes in the first grade mathematics 16-8?
The first type: first calculate 10-8=2, and then calculate 6+2=8.

The second type: Xiang 8+(8)= 16, so 16-8=8.

The third type: first calculate 16-6= 10, and then calculate 10-2=8.

If the addition is skilled, the second one is easier to add and subtract.