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3 cijfers X 3 cijfers met hulp [2]

3 cijfers X 3 cijfers met hulp [2]

 
4 6 4
7 8 2 ×
2 × 4 = 8
2 × 60 = 1 2 0
2 × 400 = 8 0 0
80 × 4 =
320
80 × 60 =
4800
80 × 400 =
32000
700 × 4 =
2800
700 × 60 =
42000
700 × 400 =
+ 280000
362848