Addition and subtraction within 10 thousand is the learning content of grade three, which belongs to skill training, that is to say, after mastering the method, training is enough

The above is the content of four-digit addition and subtraction three-digit and four-digit addition and subtraction four-digit in the addition and subtraction operation within ten thousand, which can be printed out for children to do, and pay attention to continuous carry and abdication.

Calculation method of addition and subtraction within ten thousand years;

1, "rounding" first calculates the sum of two numbers. If it just adds up to a whole ten, a whole hundred, a whole thousand, a whole ten thousand …, then count first. For example,1+9 =10,3+7 =10,2+8 =10,4+6 =10,5+5 =10. Another example is:12+88 =100,35+65 =100,21+79 =100,44+56 =100. In the above formula, 1 is called the "complement" of 9; 79 is called the "complement" of 2 1, and 44 is also called the "complement" of 56. In other words, two numbers are mutually "complement".

2. For those that cannot be rounded directly, one of the numbers can be split and rounded again. For numbers that are not directly rounded up, you can round up first and then subtract the rounded number.

3, the column, with a computer simple integer addition and subtraction can be. To calculate the subtraction within 10,000, first arrange the same number pairs in order, and subtract from the single digit. If it is not enough, borrow one from the previous one, and then subtract from the standard by adding ten. * * * Align the same digits and add and subtract units.