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3 cijfers X 3 cijfers met hulp [2]

3 cijfers X 3 cijfers met hulp [2]

 
4 2 7
6 8 1 ×
1 × 7 = 7
1 × 20 = 2 0
1 × 400 = 4 0 0
80 × 7 =
560
80 × 20 =
1600
80 × 400 =
32000
600 × 7 =
4200
600 × 20 =
12000
600 × 400 =
+ 240000
290787