(주산no.24)"응용편" 곱셈 (십의자리×일의자리)

2021 3:00
Synopsis
곱셈 * 1. 28×8 주산에서 곱셈할때는 큰수부터 곱해주므로 20×8=160을 주판에 먼저 놓고, 8×8=64를 160에 더해주면 된다. 2.
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