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3 cijfers X 2 cijfers met hulp [2]

3 cijfers X 2 cijfers met hulp [2]

 
1 2 8
1 9 ×
9 × 8 =
72
9 × 20 =
180
9 × 100 =
900
10 × 8 =
80
10 × 20 =
200
10 × 100 =
+ 1000
2432