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3 cijfers X 3 cijfers met hulp [1]

3 cijfers X 3 cijfers met hulp [1]

 
3 9 5
2 1 7 ×
7 × 5 = 3 5
7 × 90 = 6 3 0
7 × 300 = 2 1 0 0
10 × 5 = 5 0
10 × 90 = 9 0 0
10 × 300 = 3 0 0 0
200 × 5 =
1000
200 × 90 =
18000
200 × 300 =
+ 60000
85715