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3 cijfers X 2 cijfers met hulp [1]

3 cijfers X 2 cijfers met hulp [1]

 
6 7 8
2 6 ×
6 × 8 = 4 8
6 × 70 = 4 2 0
6 × 600 = 3 6 0 0
20 × 8 =
160
20 × 70 =
1400
20 × 600 =
12000
17628