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3 cijfers X 3 cijfers met hulp [2]

3 cijfers X 3 cijfers met hulp [2]

 
1 4 2
2 8 0 ×
0 × 2 = 0
0 × 40 = 0
0 × 100 = 0
80 × 2 =
160
80 × 40 =
3200
80 × 100 =
8000
200 × 2 =
400
200 × 40 =
8000
200 × 100 =
+ 20000
39760