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3 cijfers X 2 cijfers met hulp [1]

3 cijfers X 2 cijfers met hulp [1]

 
4 3 4
2 5 ×
5 × 4 = 2 0
5 × 30 = 1 5 0
5 × 400 = 2 0 0 0
20 × 4 =
80
20 × 30 =
600
20 × 400 =
8000
10850