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3 cijfers X 2 cijfers met hulp [2]

3 cijfers X 2 cijfers met hulp [2]

 
2 2 8
2 1 ×
1 × 8 =
8
1 × 20 =
20
1 × 200 =
200
20 × 8 =
160
20 × 20 =
400
20 × 200 =
+ 4000
4788