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3 cijfers X 3 cijfers met hulp [1]

3 cijfers X 3 cijfers met hulp [1]

 
1 7 8
2 8 6 ×
6 × 8 = 4 8
6 × 70 = 4 2 0
6 × 100 = 6 0 0
80 × 8 = 6 4 0
80 × 70 = 5 6 0 0
80 × 100 = 8 0 0 0
200 × 8 =
1600
200 × 70 =
14000
200 × 100 =
+ 20000
50908