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3 cijfers X 2 cijfers met hulp [1]

3 cijfers X 2 cijfers met hulp [1]

 
5 8 1
4 5 ×
5 × 1 = 5
5 × 80 = 4 0 0
5 × 500 = 2 5 0 0
40 × 1 =
40
40 × 80 =
3200
40 × 500 =
20000
26145