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3 cijfers X 3 cijfers met hulp [1]

3 cijfers X 3 cijfers met hulp [1]

 
3 2 5
2 1 5 ×
5 × 5 = 2 5
5 × 20 = 1 0 0
5 × 300 = 1 5 0 0
10 × 5 = 5 0
10 × 20 = 2 0 0
10 × 300 = 3 0 0 0
200 × 5 =
1000
200 × 20 =
4000
200 × 300 =
+ 60000
69875