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3 cijfers X 3 cijfers met hulp [1]

3 cijfers X 3 cijfers met hulp [1]

 
2 8 0
1 6 8 ×
8 × 0 = 0
8 × 80 = 6 4 0
8 × 200 = 1 6 0 0
60 × 0 = 0
60 × 80 = 4 8 0 0
60 × 200 = 1 2 0 0 0
100 × 0 =
0
100 × 80 =
8000
100 × 200 =
+ 20000
47040