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3 cijfers X 3 cijfers met hulp [1]

3 cijfers X 3 cijfers met hulp [1]

 
2 4 8
2 1 5 ×
5 × 8 = 4 0
5 × 40 = 2 0 0
5 × 200 = 1 0 0 0
10 × 8 = 8 0
10 × 40 = 4 0 0
10 × 200 = 2 0 0 0
200 × 8 =
1600
200 × 40 =
8000
200 × 200 =
+ 40000
53320