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3 cijfers X 2 cijfers met hulp [1]

3 cijfers X 2 cijfers met hulp [1]

 
4 5 8
4 8 ×
8 × 8 = 6 4
8 × 50 = 4 0 0
8 × 400 = 3 2 0 0
40 × 8 =
320
40 × 50 =
2000
40 × 400 =
16000
21984