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3 cijfers X 2 cijfers met hulp [2]

3 cijfers X 2 cijfers met hulp [2]

 
2 1 5
2 8 ×
8 × 5 =
40
8 × 10 =
80
8 × 200 =
1600
20 × 5 =
100
20 × 10 =
200
20 × 200 =
+ 4000
6020