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3 cijfers X 2 cijfers met hulp [1]

3 cijfers X 2 cijfers met hulp [1]

 
4 5 1
5 9 ×
9 × 1 = 9
9 × 50 = 4 5 0
9 × 400 = 3 6 0 0
50 × 1 =
50
50 × 50 =
2500
50 × 400 =
20000
26609