Minus nine and add one.

Minus eight plus two.

Negative seven plus three.

Negative six plus four.

Minus five and add five.

Negative four plus six.

Negative three plus seven.

Minus two and add eight

Such as: 12-9? 2+ 1=3

17-8 ? 7+2=9

First, add ten formulas.

Look at large numbers and divide them into decimals.

Made ten, plus the rest.

Clap your hands, children,

Let's sing ten songs, ok?

One equals nine and two equals eight.

Three to seven, four to six.

Five plus five equals ten.

Second, fill ten formulas.

19 19 good friend 1 9

2828 hand in hand 2, 8

Three, seven, three, seven are so close.

Four four six four six.

5555 1 hand 5,5

Remember large numbers in your mind and decimals in your hand.