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3 cijfers X 3 cijfers met hulp [1]

3 cijfers X 3 cijfers met hulp [1]

 
4 1 5
4 1 7 ×
7 × 5 = 3 5
7 × 10 = 7 0
7 × 400 = 2 8 0 0
10 × 5 = 5 0
10 × 10 = 1 0 0
10 × 400 = 4 0 0 0
400 × 5 =
2000
400 × 10 =
4000
400 × 400 =
+ 160000
173055