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3 cijfers X 2 cijfers met hulp [2]

3 cijfers X 2 cijfers met hulp [2]

 
1 2 3
1 5 ×
5 × 3 =
15
5 × 20 =
100
5 × 100 =
500
10 × 3 =
30
10 × 20 =
200
10 × 100 =
+ 1000
1845