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3 cijfers X 3 cijfers met hulp [2]

3 cijfers X 3 cijfers met hulp [2]

 
1 9 2
2 4 7 ×
7 × 2 = 1 4
7 × 90 = 6 3 0
7 × 100 = 7 0 0
40 × 2 =
80
40 × 90 =
3600
40 × 100 =
4000
200 × 2 =
400
200 × 90 =
18000
200 × 100 =
+ 20000
47424