Math problems in the first grade of primary school cross the river.

Little frog crossing the river, first grade math. There is no need to fill in the columns in brackets. Details are as follows:

Formula result:

8+8= 16,7+4= 1 1,8+7= 15, 16 -8=8, 1 1- 7=4,

15-8=7,8+6= 14,,7+6= 13,7+5= 12, 12-7=5。

Subtraction operation property

1, a number MINUS the sum of two numbers is equal to subtracting each addend in the sum from this number in turn.

2. A number minus the difference between two numbers is equal to this number minus the minuend in the difference first, and then minus it.

Subtract a number from the sum of several numbers. You can choose any addend to subtract this number and then add it to the rest of the addends.

4. If a number subtracts several numbers in succession, you can add all the subtractions first, and then subtract the sum of the subtractions from the minuend.

Refer to the above information? Baidu encyclopedia-four operations

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