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3 cijfers X 2 cijfers met hulp [2]

3 cijfers X 2 cijfers met hulp [2]

 
4 5 7
4 1 ×
1 × 7 =
7
1 × 50 =
50
1 × 400 =
400
40 × 7 =
280
40 × 50 =
2000
40 × 400 =
+ 16000
18737