9.56? +? 3.5? =? 13.06
5.98? +? 4.59? =? 10.57
9. 12? 4.89? =? 4.23
5.37? 4.5? =? 0.87
6.98? 4.59? =? 2.39
definition
Addition: the operation of combining two numbers into one number.
Subtraction: when two addends and one of them are known, the operation of finding the other addend.
Multiplication: the operation of finding the product of two numbers.
(1) Multiplying a number with an integer is a simple operation, and you can find the sum of several identical addends.
(2) Multiply a number by a decimal to find a few tenths, a few percent and a few thousandths of this number.
(3) A number multiplied by a fraction is a fraction of this number.
Division: the operation of finding another factor by knowing the product of two factors and one of them.