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3 cijfers X 3 cijfers met hulp [1]

3 cijfers X 3 cijfers met hulp [1]

 
2 7 7
3 1 7 ×
7 × 7 = 4 9
7 × 70 = 4 9 0
7 × 200 = 1 4 0 0
10 × 7 = 7 0
10 × 70 = 7 0 0
10 × 200 = 2 0 0 0
300 × 7 =
2100
300 × 70 =
21000
300 × 200 =
+ 60000
87809