어렸을 때부터 배웠던 곱셈 계산 방법을 조금만 변형하면 더 쉽고 빠르게 계산할 수 있어요 :D

1-① 두 자릿수 ‘곱셈’

how to multiplication 01

how to multiplication 02

how to multiplication 03

 

1-② 두 자릿수 ‘곱셈'(예제)

how to multiplication 04

how to multiplication 05

how to multiplication 06

how to multiplication 07

 

1-③ 11~19단 쉽게 암산하기(응용)

how to multiplication 08

how to multiplication 09

how to multiplication 10

 

2. 세 자릿수 x 두 자릿수

how to multiplication 11

how to multiplication 12

how to multiplication 13

how to multiplication 14

how to multiplication 15

 

3. 세 자릿수 x 세 자릿수

how to multiplication 16

how to multiplication 17

how to multiplication 19

how to multiplication 20

how to multiplication 21

how to multiplication 22