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3 cijfers X 3 cijfers met hulp [1]

3 cijfers X 3 cijfers met hulp [1]

 
2 9 9
2 6 9 ×
9 × 9 = 8 1
9 × 90 = 8 1 0
9 × 200 = 1 8 0 0
60 × 9 = 5 4 0
60 × 90 = 5 4 0 0
60 × 200 = 1 2 0 0 0
200 × 9 =
1800
200 × 90 =
18000
200 × 200 =
+ 40000
80431