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3 cijfers X 3 cijfers met hulp [3]

3 cijfers X 3 cijfers met hulp [3]

 
5 5 7
8 2 7 ×
7 × 7 =
49
7 × 50 =
350
7 × 500 =
3500
20 × 7 =
140
20 × 50 =
1000
20 × 500 =
10000
800 × 7 =
5600
800 × 50 =
40000
800 × 500 =
+ 400000
460639