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3 cijfers X 2 cijfers met hulp [2]

3 cijfers X 2 cijfers met hulp [2]

 
4 8 9
4 7 ×
7 × 9 =
63
7 × 80 =
560
7 × 400 =
2800
40 × 9 =
360
40 × 80 =
3200
40 × 400 =
+ 16000
22983