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3 cijfers X 2 cijfers met hulp [2]

3 cijfers X 2 cijfers met hulp [2]

 
4 7 2
4 9 ×
9 × 2 =
18
9 × 70 =
630
9 × 400 =
3600
40 × 2 =
80
40 × 70 =
2800
40 × 400 =
+ 16000
23128