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3 cijfers X 3 cijfers met hulp [1]

3 cijfers X 3 cijfers met hulp [1]

 
2 8 7
3 7 8 ×
8 × 7 = 5 6
8 × 80 = 6 4 0
8 × 200 = 1 6 0 0
70 × 7 = 4 9 0
70 × 80 = 5 6 0 0
70 × 200 = 1 4 0 0 0
300 × 7 =
2100
300 × 80 =
24000
300 × 200 =
+ 60000
108486