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3 cijfers X 2 cijfers met hulp [1]

3 cijfers X 2 cijfers met hulp [1]

 
3 7 1
2 8 ×
8 × 1 = 8
8 × 70 = 5 6 0
8 × 300 = 2 4 0 0
20 × 1 =
20
20 × 70 =
1400
20 × 300 =
6000
10388