Question

Please ESTIMATE what is 130% of 20!!!! I already know that it is exactly 26. Though I need to know how you can go upon ESTIMATING IT

Answer 1

100% of 20 is 20. Now we have 30% to add to it.

We know 25% of 20 is 5 since 20/4 = 5.. Since 25% is close to 30% this is a close estimate.

We get 25 this way

Answer 2

130% is pretty close to 150%, which means "the whole thing, plus another half."

If we wanted to find 150% of 20, we just take the whole thing (20) and add another half (10), getting a slight overestimation of 20 + 10 = 30. Compare this to the actual answer, 26, and you see that we're only about 4 off.

Edit: The 125% estimate is actually a lot closer than mine, so I'd go with that!