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3 cijfers X 2 cijfers met hulp [1]

3 cijfers X 2 cijfers met hulp [1]

 
2 4 1
2 3 ×
3 × 1 = 3
3 × 40 = 1 2 0
3 × 200 = 6 0 0
20 × 1 =
20
20 × 40 =
800
20 × 200 =
4000
5543