







Compatible numbers 
20180102 

From Natalie: 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. Answered by Penny Nom. 





Compatible numbers 
20081107 

From Erika: 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? Answered by Penny Nom. 





Compatible numbers 
20081030 

From Paul: Use compatible numbers to estimate the quotient of 23.52 and 11.04 Answered by Penny Nom. 





Compatible numbers 
20081002 

From jeff: 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? Answered by Harley Weston. 





Compatible numbers 
20080925 

From Katie: 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 Answered by Penny Nom. 





Compatible numbers 
20080404 

From dawn: Need help. Estimate the quotient. Tell what compatible numbers you used.
817divided by 4 = Answered by Penny Nom. 





Compatible numbers 
20071119 

From Brendan: 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? Answered by Penny Nom. 





Compatible numbers 
20071030 

From Gary: How do I estimate the quotient. and then tell what compatible numbers were used. 703/7 Answered by Penny Nom. 





Compatible numbers 
20070905 

From Beth: Estimate using compatible numbers:
2 X 3978 =
102/25 = Answered by Stephen la Rocque. 





Compatible numbers 
20070901 

From andrea: Estimate using compatible numbers. 249 /64 Answered by Harley Weston. 





Compatible numbers 
20070615 

From meryl: what is a compatible number? ex.6,321/8 Answered by Penny Nom. 





Compatible numbers 
20000127 

From Angie: Use compatible numbers to estimate each product and quotient. 23*1/2 1/3*11 Answered by Penny Nom. 

