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3 cijfers X 2 cijfers met hulp [1]

3 cijfers X 2 cijfers met hulp [1]

 
5 8 5
2 7 ×
7 × 5 = 3 5
7 × 80 = 5 6 0
7 × 500 = 3 5 0 0
20 × 5 =
100
20 × 80 =
1600
20 × 500 =
10000
15795