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3 cijfers X 3 cijfers met hulp [2]

3 cijfers X 3 cijfers met hulp [2]

 
6 8 6
5 4 7 ×
7 × 6 = 4 2
7 × 80 = 5 6 0
7 × 600 = 4 2 0 0
40 × 6 =
240
40 × 80 =
3200
40 × 600 =
24000
500 × 6 =
3000
500 × 80 =
40000
500 × 600 =
+ 300000
375242