Ten-point method

Ten songs: September 19 and September 1 Sunday are good friends (1+9 = 9+1=10), February 8 and August 2 are hand in hand (2+8 = 8+2 =

Addition formula within 20 decimal places: look at large numbers, divide them by decimals, make up ten, and add the remainder. (Basic Edition)

(upgraded version)

Nine plus several = 10 plus (minus 1), such as: 9+6 =10+(6-1) =15.

Eight plus several = 10 plus (minus two), such as: 8+6= 10+(6-2)= 14.

Seven plus several = 10 plus (minus three), such as: 7+6= 10+(6-3)= 13.

Six plus several = 10 plus (minus four), such as: 6+6= 10+(6-4)= 12.

Five plus several = 10 plus (minus five), such as: 5+6 =10+(6-5) =11.

Mathematical addition and subtraction tips:

Let the children understand and recite the formula of filling ten.

Good friends of 9 1 year,

2882 hand in hand,

Three, seven, seven, three are so close,

Four, six, six, four, shoulder to shoulder,

Make a pair of hands in half.

Carry addition. Formula: "Add nine and subtract one, add eight and subtract two, add seven and subtract three, add six and subtract four, and add five and subtract five." How to use the formula? Take "plus nine MINUS one" as an example. "Add nine and subtract one" refers to the addition of a number and 9, and the number minus 1 is the unit of their sum.

Subtraction by abdication. Formula: "minus nine plus one, minus eight plus two, minus seven plus three, minus six plus four, minus five plus five." How to use the formula? Take "minus nine plus one" as an example. "Minus nine plus one" means a number minus nine, and the result of adding 1 to this number is their difference.