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3 cijfers X 3 cijfers met hulp [2]

3 cijfers X 3 cijfers met hulp [2]

 
1 3 9
1 2 1 ×
1 × 9 = 9
1 × 30 = 3 0
1 × 100 = 1 0 0
20 × 9 =
180
20 × 30 =
600
20 × 100 =
2000
100 × 9 =
900
100 × 30 =
3000
100 × 100 =
+ 10000
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