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3 cijfers X 2 cijfers met hulp [2]

3 cijfers X 2 cijfers met hulp [2]

 
3 1 4
5 7 ×
7 × 4 =
28
7 × 10 =
70
7 × 300 =
2100
50 × 4 =
200
50 × 10 =
500
50 × 300 =
+ 15000
17898