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3 cijfers X 3 cijfers met hulp [2]

3 cijfers X 3 cijfers met hulp [2]

 
1 2 9
2 8 6 ×
6 × 9 = 5 4
6 × 20 = 1 2 0
6 × 100 = 6 0 0
80 × 9 =
720
80 × 20 =
1600
80 × 100 =
8000
200 × 9 =
1800
200 × 20 =
4000
200 × 100 =
+ 20000
36894