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3 cijfers X 2 cijfers met hulp [2]

3 cijfers X 2 cijfers met hulp [2]

 
3 7 9
5 1 ×
1 × 9 =
9
1 × 70 =
70
1 × 300 =
300
50 × 9 =
450
50 × 70 =
3500
50 × 300 =
+ 15000
19329