Answer:
Estimate [tex]\frac{5}{8}-\frac{1}{10}[/tex]: B [tex]\frac{1}{2}[/tex]
Common denominator of [tex]\frac{1}{4}and\frac{3}{5}[/tex]: D 20
Step-by-step explanation:
In the first question, it is asking for just an estimate. Looking at the first fraction of [tex]\frac{5}{8}[/tex], you can see that this the amount is very close to [tex]\frac{4}{8}[/tex] which is [tex]\frac{1}{2}[/tex], but [tex]\frac{5}{8}[/tex] would be a little more. Since you are subtracting [tex]\frac{1}{10}[/tex], which would be a very small amount, the best estimate is:
B [tex]\frac{1}{2}[/tex]
In the second question, finding a common denominator between fractions means looking for the least common multiple:
4: 4, 8, 12, 16, 20
5: 5, 10, 15, 20
So, the lowest common denominator is 20 which is answer choice D.
