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3 cijfers X 2 cijfers met hulp [1]

3 cijfers X 2 cijfers met hulp [1]

 
4 9 1
5 1 ×
1 × 1 = 1
1 × 90 = 9 0
1 × 400 = 4 0 0
50 × 1 =
50
50 × 90 =
4500
50 × 400 =
20000
25041