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3 cijfers X 2 cijfers met hulp [1]

3 cijfers X 2 cijfers met hulp [1]

 
1 8 9
1 6 ×
6 × 9 = 5 4
6 × 80 = 4 8 0
6 × 100 = 6 0 0
10 × 9 =
90
10 × 80 =
800
10 × 100 =
1000
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