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3 cijfers X 3 cijfers met hulp [2]

3 cijfers X 3 cijfers met hulp [2]

 
2 9 1
1 3 2 ×
2 × 1 = 2
2 × 90 = 1 8 0
2 × 200 = 4 0 0
30 × 1 =
30
30 × 90 =
2700
30 × 200 =
6000
100 × 1 =
100
100 × 90 =
9000
100 × 200 =
+ 20000
38412