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3 cijfers X 2 cijfers met hulp [2]

3 cijfers X 2 cijfers met hulp [2]

 
5 7 1
4 1 ×
1 × 1 =
1
1 × 70 =
70
1 × 500 =
500
40 × 1 =
40
40 × 70 =
2800
40 × 500 =
+ 20000
23411