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3 cijfers X 2 cijfers met hulp [1]

3 cijfers X 2 cijfers met hulp [1]

 
1 4 8
1 3 ×
3 × 8 = 2 4
3 × 40 = 1 2 0
3 × 100 = 3 0 0
10 × 8 =
80
10 × 40 =
400
10 × 100 =
1000
1924