Minus nine and add one,

Minus eight and add two,

Minus seven and add three,

Subtract 6 and 4,

Minus five and add five,

Subtract four and six,

Subtract three and seven,

Minus two and add eight,

Break large numbers and increase decimals.

Extended data:

Make up ten rhyming poems:

19 19 years of good friends,

2828 holding hands, 3737 so close,

Let's go together, four, four, six, six.

Make a pair of hands in half.

Look at large numbers and divide them into decimals.

Made ten, plus the rest.

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

One plus nine, ten tadpoles,

Two plus eight, ten old ducks, three plus seven, ten old hens,

Four plus six, ten golden monkeys,

Five plus five, ten big tigers.

See 9 and think of 1,

Think of 2 when you see 8, think of 3 when you see 7,

See 6, think of 4.

See Osuka decimal,

Switch these two figures first.