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3 cijfers X 2 cijfers met hulp [1]

3 cijfers X 2 cijfers met hulp [1]

 
6 9 8
2 1 ×
1 × 8 = 8
1 × 90 = 9 0
1 × 600 = 6 0 0
20 × 8 =
160
20 × 90 =
1800
20 × 600 =
12000
14658