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3 cijfers X 2 cijfers met hulp [1]

3 cijfers X 2 cijfers met hulp [1]

 
3 4 9
2 1 ×
1 × 9 = 9
1 × 40 = 4 0
1 × 300 = 3 0 0
20 × 9 =
180
20 × 40 =
800
20 × 300 =
6000
7329