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3 cijfers X 3 cijfers met hulp [2]

3 cijfers X 3 cijfers met hulp [2]

 
2 3 7
2 9 1 ×
1 × 7 = 7
1 × 30 = 3 0
1 × 200 = 2 0 0
90 × 7 =
630
90 × 30 =
2700
90 × 200 =
18000
200 × 7 =
1400
200 × 30 =
6000
200 × 200 =
+ 40000
68967