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3 cijfers X 2 cijfers met hulp [1]

3 cijfers X 2 cijfers met hulp [1]

 
1 2 2
1 4 ×
4 × 2 = 8
4 × 20 = 8 0
4 × 100 = 4 0 0
10 × 2 =
20
10 × 20 =
200
10 × 100 =
1000
1708