Question

110,568÷220−568÷220

Calculate efficiently in your head.

Answer 1

500?

Explanation:

Answer 2

500

Explanation:

Mental calculation often makes use of factoring and cancelling of factors. To the greatest possible extent, multiplying or dividing by powers of 2, 5 and 10 are also used.

`(110568)/(220)-(568)/(220)=(110568-568)/(220)=(110000)/(220)\\\\=(110)/(220)\cdot1000=(1)/(2)\cdot1000=\boxed{500}`