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3 cijfers X 2 cijfers met hulp [2]

3 cijfers X 2 cijfers met hulp [2]

 
4 5 7
3 4 ×
4 × 7 =
28
4 × 50 =
200
4 × 400 =
1600
30 × 7 =
210
30 × 50 =
1500
30 × 400 =
+ 12000
15538