Posted by abraham on Friday, January 21, 2011 at 8:03am.
using rounding or compatible numbers,which numbers would you choose to estimate the exact product of 25 times 25.

math  drwls, Friday, January 21, 2011 at 8:22am
I don't see how one would get an exact answer by rounding.
Try using this:
(a c)(b +c) = ab + (ab)c  c^2
with a = 30, b = 20 and c = 5
25 * 25 = 600 + 50  25 = 625

math  Jen, Friday, January 21, 2011 at 10:55am
I would round by doing 20 * 30, since 25 is exactly halfway between. 2 * 3 = 6, put 2 0's on the end..600

math  drwls, Friday, January 21, 2011 at 11:05am
"Estimating the exact product" seems like an oxymoron to me.

math  555 plus 400, Sunday, September 16, 2012 at 10:48pm
955
Answer This Question
Related Questions
 Math  Estimate each product using rounding or compatible numbers. 1. 0.97 x 312...
 4th grade math  3. Writing to Explain Use rounding to estimate the product 13...
 math  estimate using compatible numbers or other methods. estimate by rounding ...
 Math  How do you estimate using rounding or compatible numbers like 0.97x312?
 Math  Estimate the total weight of two boxes that weigh 9.4 lb and 62.6 lb ...
 Math  Estimate the total weight of two boxes that weigh 9.4 lb and 62.6 lb ...
 Math  Estimate the total weight of two boxes that weigh 9.4 lb and 62.6 ib ...
 Math Word Problem  Estimate the total weight of two boxes that weigh 9.4 lb and...
 math  estimate the total weight of two boxes that weigh 9.4lb and 62.6 lb using...
 4th grade math  explain why it can be better to use compatible numbers to ...
More Related Questions