Skill 13E
Estimate Quotients
When asking the student to estimate a quotient in a division problem, he/she should think to round the dividend (first number below) to 250 and 200 (since they are the closest rounded numbers above and below 229 that are easily divisible by 5.  Therefore, the student should use 250 divided by 5 = 50 and then use 200 divided by 5 = 40.  With a little practice this gets much easier.
 

What is the best estimated quotients. Use compatible numbers.

229 5
a. 4 or 5 b. 40 or 50 c. 50 or 60