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3 cijfers X 3 cijfers met hulp [1]

3 cijfers X 3 cijfers met hulp [1]

 
2 4 5
2 4 7 ×
7 × 5 = 3 5
7 × 40 = 2 8 0
7 × 200 = 1 4 0 0
40 × 5 = 2 0 0
40 × 40 = 1 6 0 0
40 × 200 = 8 0 0 0
200 × 5 =
1000
200 × 40 =
8000
200 × 200 =
+ 40000
60515