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3 cijfers X 2 cijfers met hulp [1]

3 cijfers X 2 cijfers met hulp [1]

 
2 5 1
3 7 ×
7 × 1 = 7
7 × 50 = 3 5 0
7 × 200 = 1 4 0 0
30 × 1 =
30
30 × 50 =
1500
30 × 200 =
6000
9287