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3 cijfers X 2 cijfers met hulp [1]

3 cijfers X 2 cijfers met hulp [1]

 
4 9 4
2 8 ×
8 × 4 = 3 2
8 × 90 = 7 2 0
8 × 400 = 3 2 0 0
20 × 4 =
80
20 × 90 =
1800
20 × 400 =
8000
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