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3 cijfers X 2 cijfers met hulp [1]

3 cijfers X 2 cijfers met hulp [1]

 
2 3 1
4 8 ×
8 × 1 = 8
8 × 30 = 2 4 0
8 × 200 = 1 6 0 0
40 × 1 =
40
40 × 30 =
1200
40 × 200 =
8000
11088