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3 cijfers X 2 cijfers met hulp [1]

3 cijfers X 2 cijfers met hulp [1]

 
4 5 8
2 2 ×
2 × 8 = 1 6
2 × 50 = 1 0 0
2 × 400 = 8 0 0
20 × 8 =
160
20 × 50 =
1000
20 × 400 =
8000
10076