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3 cijfers X 2 cijfers met hulp [2]

3 cijfers X 2 cijfers met hulp [2]

 
5 4 0
5 8 ×
8 × 0 =
0
8 × 40 =
320
8 × 500 =
4000
50 × 0 =
0
50 × 40 =
2000
50 × 500 =
+ 25000
31320