How to abdicate in 20 years and subtract the mathematical tabloids?

Subtraction of abdication within 20 includes ten methods and ten methods.

1. First do abdication subtraction with steps, and then draw lovely digital figures on each step.

2. Then draw a book and write math poems.

(1) Ten addition formula:

1, 19 19 Good friend, 2828 holding hands, 3737 really close, 4646 walking together, 555 1 hand.

2, 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, and ten big tigers.

(2) Breaking the Ten Laws:

The ten-break method is to solve the problem that a dozen people are reduced and the number of digits is not enough. When the unit is not reduced enough, subtract the subtraction with 10, and add the remainder with the number in the unit, that is, break the ten method. For example:15-9 = 6 (10-9 =1,1+5=6).

3. Then write the title.

4. Just paint your favorite color at last.