The teaching formula of "supplementing ten methods";

19 19 years of good friends (1 9)

2828 Hand in Hand (2, 8)

3737 is really close (3, 7)

Let's go to 4646 (4, 6)

Five, five, five, five hands (five, five)

Collect ten songs

19 19 years of good friends,

Hand in hand,

3737 is so close,

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

Make a pair of hands in half.

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.

Think of 1 when you see 9, and think of 2 when you see 8.

Think of 3 when you see 7, and think of 4 when you see 6. ?

When you see the big corner decimal system, switch the two numbers first.