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3 cijfers X 3 cijfers met hulp [1]

3 cijfers X 3 cijfers met hulp [1]

 
3 4 1
1 7 1 ×
1 × 1 = 1
1 × 40 = 4 0
1 × 300 = 3 0 0
70 × 1 = 7 0
70 × 40 = 2 8 0 0
70 × 300 = 2 1 0 0 0
100 × 1 =
100
100 × 40 =
4000
100 × 300 =
30000
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