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3 cijfers X 3 cijfers met hulp [2]

3 cijfers X 3 cijfers met hulp [2]

 
2 4 7
2 4 8 ×
8 × 7 = 5 6
8 × 40 = 3 2 0
8 × 200 = 1 6 0 0
40 × 7 =
280
40 × 40 =
1600
40 × 200 =
8000
200 × 7 =
1400
200 × 40 =
8000
200 × 200 =
+ 40000
61256