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3 cijfers X 2 cijfers met hulp [1]

3 cijfers X 2 cijfers met hulp [1]

 
3 3 8
3 9 ×
9 × 8 = 7 2
9 × 30 = 2 7 0
9 × 300 = 2 7 0 0
30 × 8 =
240
30 × 30 =
900
30 × 300 =
9000
13182