Question

Margo estimate 188/5 to be between 30 and 40.which basic fact did she use to help her estimate?

Answer 1

Margo estimated the fraction 188/5 to be between 30 and 40 by using multiplication facts: 5 times 30 is 150 and 5 times 40 is 200, placing 188 within that range. It demonstrates the skill of estimation using mental math.

Step-by-step explanation:

The student is asking about how Margo estimated that the fraction 188/5 is between 30 and 40. Margo likely used the basic fact that 5 times 30 is 150 and 5 times 40 is 200 to help her make this approximation. Since 188 is between 150 and 200, she correctly estimated that 188 divided by 5 would result in a value between 30 and 40. This approach is a form of mental math that relies on multiplication facts and place value to quickly estimate fractions or divisions without the need for precise calculations or long division. It's a useful skill for checking the reasonableness of a calculated answer.

Answer 2

I think she used the fact that it's fairly easy to multiply 5 by 30: it's 150 (and 188 is bigger than this, so the actual result must be bigger than 30) and it's also easy to multiply 5 by 40: it's 200 (and 188 is smaller than this so the actual result must be smaller bigger than 40) : so 188 must be somewhere in between