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3 cijfers X 3 cijfers met hulp [1]

3 cijfers X 3 cijfers met hulp [1]

 
2 8 3
1 9 9 ×
9 × 3 = 2 7
9 × 80 = 7 2 0
9 × 200 = 1 8 0 0
90 × 3 = 2 7 0
90 × 80 = 7 2 0 0
90 × 200 = 1 8 0 0 0
100 × 3 =
300
100 × 80 =
8000
100 × 200 =
+ 20000
56317