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3 cijfers X 2 cijfers met hulp [1]

3 cijfers X 2 cijfers met hulp [1]

 
2 2 8
2 5 ×
5 × 8 = 4 0
5 × 20 = 1 0 0
5 × 200 = 1 0 0 0
20 × 8 =
160
20 × 20 =
400
20 × 200 =
4000
5700