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3 cijfers X 2 cijfers met hulp [2]

3 cijfers X 2 cijfers met hulp [2]

 
5 8 7
2 2 ×
2 × 7 =
14
2 × 80 =
160
2 × 500 =
1000
20 × 7 =
140
20 × 80 =
1600
20 × 500 =
+ 10000
12914