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3 cijfers X 2 cijfers met hulp [1]

3 cijfers X 2 cijfers met hulp [1]

 
4 1 3
2 9 ×
9 × 3 = 2 7
9 × 10 = 9 0
9 × 400 = 3 6 0 0
20 × 3 =
60
20 × 10 =
200
20 × 400 =
8000
11977