Hello:
How can i solve this quickly in my head no pen or paper:
20% of 6945
Another way: \(\displaystyle 20\%= \frac{20}{100}= \frac{2}{10}\) so start by doubling the number: 2(6945)= 13890 (you can double in your head, can't you?) Then divide by 10 by moving the decimal point over:1389.0.
Usually in mental arithmetic you are not supposed to find an exact answer but an approximate answer.Hello:
How can i solve this quickly in my head no pen or paper:
20% of 6945
Well, Denis, at least I know that you will be in the corner with me. I don't know what you have done, but whatever it was was bad enough. As for me I am just a reprobate.OMG!!
.2 * 7000 = 2 * 700
2 * 700 = 1400
To the corner, and no dessert!
:shock: