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3 cijfers X 2 cijfers met hulp [1]

3 cijfers X 2 cijfers met hulp [1]

 
1 7 9
1 2 ×
2 × 9 = 1 8
2 × 70 = 1 4 0
2 × 100 = 2 0 0
10 × 9 =
90
10 × 70 =
700
10 × 100 =
1000
2148