







Compatible numbers 
20180102 

Natalie pose la question : I'm in 4th grade and two weeks ago my class learned how to use compatible numbers.
I was REALLY confused but I didn't want to say I didn't understand because I just wanted to go home.
Tomorrow we have the Topic 7 Test and I'm stuck on a problem that requires using compatible numbers.
My mom apparently hasn't heard of compatible numbers and she can't really help me too much.
Here's the problem : The local library places new books in a section with 31 shelves. Each shelf
fits 18 books. Use compatible numbers to estimate the number of books that the library can fit on
the shelves. Penny Nom lui répond. 





Compatible numbers 
20081107 

Erika pose la question : When working with compatible numbers, when do you choose to round up or down? For example: In the problem: 373 divided by 4, one could round 373 to 400 and keep the 4 the same, and the answer would be 100; OR, one could round 373 down to 360 and keep the 4 the same, and the answer would be 90. When given the problem as an assignment, which way dictates how one would round, up or down? Penny Nom lui répond. 





Compatible numbers 
20081030 

Paul pose la question : Use compatible numbers to estimate the quotient of 23.52 and 11.04 Penny Nom lui répond. 





Compatible numbers 
20081002 

jeff pose la question : what exactly are compatible numbers,
math problem is:
Estimate the total weight of 2 boxes that weigh 9.4 pounds and 62,6 pounds
using rounding and compatible numbers. Which estimate is closer to the actual weight and why? Harley Weston lui répond. 





Compatible numbers 
20080925 

Katie pose la question : I am having trouble remembering how to find compatible numbers used to find the estimate in the foloowing problem. Can you please help me solve it and explain it to me? My son is in 5th grade and I need help. Thank you. Here is the problem: 2,752 / 28 estimate: 90 Penny Nom lui répond. 





Compatible numbers 
20080404 

dawn pose la question : Need help. Estimate the quotient. Tell what compatible numbers you used.
817divided by 4 = Penny Nom lui répond. 





Compatible numbers 
20071119 

Brendan pose la question : Let's say you have 291/2 and its between 281/2=14 and 301/2=15. My question is where do the
14 and the 15 come from or in other words how do you get those? Penny Nom lui répond. 





Compatible numbers 
20071030 

Gary pose la question : How do I estimate the quotient. and then tell what compatible numbers were used. 703/7 Penny Nom lui répond. 





Compatible numbers 
20070905 

Beth pose la question : Estimate using compatible numbers:
2 X 3978 =
102/25 = Stephen la Rocque lui répond. 





Compatible numbers 
20070901 

andrea pose la question : Estimate using compatible numbers. 249 /64 Harley Weston lui répond. 





Compatible numbers 
20070615 

meryl pose la question : what is a compatible number? ex.6,321/8 Penny Nom lui répond. 





Compatible numbers 
20000127 

Angie pose la question : Use compatible numbers to estimate each product and quotient. 23*1/2 1/3*11 Penny Nom lui répond. 

