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3 cijfers X 3 cijfers met hulp [1]

3 cijfers X 3 cijfers met hulp [1]

 
2 4 7
4 4 8 ×
8 × 7 = 5 6
8 × 40 = 3 2 0
8 × 200 = 1 6 0 0
40 × 7 = 2 8 0
40 × 40 = 1 6 0 0
40 × 200 = 8 0 0 0
400 × 7 =
2800
400 × 40 =
16000
400 × 200 =
+ 80000
110656