Checking Reasonableness of Fraction Sums I
Interactive practice questions
Rosey is working on a problem and has to calculate $\frac{1}{22}+\frac{15}{16}$122+1516. She says the answer is about $1$1. Let’s see if her estimate is reasonable.
Let’s look at $\frac{1}{22}$122. Which value below is the best estimate for $\frac{1}{22}$122?
$2$2
$\frac{1}{2}$12
$0$0
$1$1
Now let’s look at $\frac{15}{16}$1516. Which value below is the best estimate for $\frac{15}{16}$1516?
$\frac{1}{2}$12
$1$1
$2$2
$0$0
Rewrite the fraction sum using the rounded values. Do not add the values together.
Calculate the sum $0+1$0+1.
Is Rosey's estimate reasonable?
Yes
No
Hermione is working on a problem and has to calculate $\frac{15}{16}+\frac{11}{12}$1516+1112. She says the answer is about $2$2. Let’s see if her estimate is reasonable.
Laura is working on a problem and has to calculate $\frac{19}{39}+\frac{32}{65}$1939+3265. She says the answer is about $1$1. Let’s see if her estimate is reasonable.
Robert is working on a problem and has to calculate $\frac{1}{22}+\frac{1}{30}$122+130. He says the answer is a very small number. Let’s see if his estimate is reasonable.