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3 cijfers X 3 cijfers met hulp [3]

3 cijfers X 3 cijfers met hulp [3]

 
8 8 4
9 8 3 ×
3 × 4 =
12
3 × 80 =
240
3 × 800 =
2400
80 × 4 =
320
80 × 80 =
6400
80 × 800 =
64000
900 × 4 =
3600
900 × 80 =
72000
900 × 800 =
+ 720000
868972