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3 cijfers X 3 cijfers met hulp [3]

3 cijfers X 3 cijfers met hulp [3]

 
3 8 5
3 7 6 ×
6 × 5 =
30
6 × 80 =
480
6 × 300 =
1800
70 × 5 =
350
70 × 80 =
5600
70 × 300 =
21000
300 × 5 =
1500
300 × 80 =
24000
300 × 300 =
+ 90000
144760