Subtraction of abdication means that when two numbers are subtracted and the number of digits to be subtracted is not enough, borrowing the previous digit is equivalent to adding 10 to this digit and then calculating. Subtraction by abdication is a special mathematical term, which can also be called subtraction by borrowing.
Subtraction is one of the four operations, and the operation of subtracting one number from another is called subtraction; Given the sum of two addends and one of them, the operation of finding the other addend is called subtraction. The symbol of subtraction is "-",which is pronounced as negative sign.
In the initial stage of abdication subtraction, children can experience the computer theory of abdication subtraction first through more intuitive and vivid methods. For example, if you count 16-9, you can let the children take out one by one from 16 sticks by counting. After eating nine times, how many sticks are left?
You can also ask your child to draw 16 sticks with a pencil in a simple way, and then erase them one by one. I wiped it nine times. How much is left? For beginners, the method of subtracting 1 one by one can experience the internal mechanism of abdication subtraction more vividly.
Break ten methods
The method of breaking ten is based on children's proficiency in addition and subtraction within 10 and their familiarity with the composition of two digits. If 15-9 is calculated. Breaking ten means breaking 15 into two numbers: 10 and 5.
Then subtract 9 from 10 to get the difference of 1, and then add 1 and the split 5 to get 6, that is, 15-9=6. The essence of the ten-breaking method is to change the unfamiliar into the familiar, that is, to change abdication addition into addition and subtraction within 10.