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3 cijfers X 3 cijfers met hulp [3]

3 cijfers X 3 cijfers met hulp [3]

 
5 8 3
5 4 1 ×
1 × 3 =
3
1 × 80 =
80
1 × 500 =
500
40 × 3 =
120
40 × 80 =
3200
40 × 500 =
20000
500 × 3 =
1500
500 × 80 =
40000
500 × 500 =
+ 250000
315403