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3 cijfers X 2 cijfers met hulp [2]

3 cijfers X 2 cijfers met hulp [2]

 
6 8 4
4 2 ×
2 × 4 =
8
2 × 80 =
160
2 × 600 =
1200
40 × 4 =
160
40 × 80 =
3200
40 × 600 =
+ 24000
28728