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3 cijfers X 2 cijfers met hulp [1]

3 cijfers X 2 cijfers met hulp [1]

 
1 3 9
1 8 ×
8 × 9 = 7 2
8 × 30 = 2 4 0
8 × 100 = 8 0 0
10 × 9 =
90
10 × 30 =
300
10 × 100 =
1000
2502