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3 cijfers X 2 cijfers met hulp [1]

3 cijfers X 2 cijfers met hulp [1]

 
4 4 3
4 9 ×
9 × 3 = 2 7
9 × 40 = 3 6 0
9 × 400 = 3 6 0 0
40 × 3 =
120
40 × 40 =
1600
40 × 400 =
16000
21707