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3 cijfers X 3 cijfers met hulp [1]

3 cijfers X 3 cijfers met hulp [1]

 
2 8 5
1 2 9 ×
9 × 5 = 4 5
9 × 80 = 7 2 0
9 × 200 = 1 8 0 0
20 × 5 = 1 0 0
20 × 80 = 1 6 0 0
20 × 200 = 4 0 0 0
100 × 5 =
500
100 × 80 =
8000
100 × 200 =
+ 20000
36765