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3 cijfers X 3 cijfers met hulp [2]

3 cijfers X 3 cijfers met hulp [2]

 
3 9 8
6 9 5 ×
5 × 8 = 4 0
5 × 90 = 4 5 0
5 × 300 = 1 5 0 0
90 × 8 =
720
90 × 90 =
8100
90 × 300 =
27000
600 × 8 =
4800
600 × 90 =
54000
600 × 300 =
+ 180000
276610