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3 cijfers X 2 cijfers met hulp [1]

3 cijfers X 2 cijfers met hulp [1]

 
2 5 5
2 7 ×
7 × 5 = 3 5
7 × 50 = 3 5 0
7 × 200 = 1 4 0 0
20 × 5 =
100
20 × 50 =
1000
20 × 200 =
4000
6885