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3 cijfers X 3 cijfers met hulp [1]

3 cijfers X 3 cijfers met hulp [1]

 
1 9 2
1 1 9 ×
9 × 2 = 1 8
9 × 90 = 8 1 0
9 × 100 = 9 0 0
10 × 2 = 2 0
10 × 90 = 9 0 0
10 × 100 = 1 0 0 0
100 × 2 =
200
100 × 90 =
9000
100 × 100 =
+ 10000
22848