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3 cijfers X 2 cijfers met hulp [1]

3 cijfers X 2 cijfers met hulp [1]

 
5 2 7
4 3 ×
3 × 7 = 2 1
3 × 20 = 6 0
3 × 500 = 1 5 0 0
40 × 7 =
280
40 × 20 =
800
40 × 500 =
20000
22661