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3 cijfers X 3 cijfers met hulp [2]

3 cijfers X 3 cijfers met hulp [2]

 
1 7 8
1 7 1 ×
1 × 8 = 8
1 × 70 = 7 0
1 × 100 = 1 0 0
70 × 8 =
560
70 × 70 =
4900
70 × 100 =
7000
100 × 8 =
800
100 × 70 =
7000
100 × 100 =
+ 10000
30438