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3 cijfers X 2 cijfers met hulp [2]

3 cijfers X 2 cijfers met hulp [2]

 
1 1 7
1 1 ×
1 × 7 =
7
1 × 10 =
10
1 × 100 =
100
10 × 7 =
70
10 × 10 =
100
10 × 100 =
+ 1000
1287