ISEE Lower Level Math : How to find the whole from the part

Study concepts, example questions & explanations for ISEE Lower Level Math

varsity tutors app store varsity tutors android store

Example Questions

Example Question #92 : Isee Lower Level (Grades 5 6) Mathematics Achievement

There are 4 canoes at a summer camp. Each canoe can hold a maximum of 6 campers, but each canoe must have an even number of campers in order to maintain balance.

Which of the following is NOT a possible number of campers who could have paddled from one end of the lake to the other using all 4 canoes?

Possible Answers:

\(\displaystyle 20\)

\(\displaystyle 12\)

\(\displaystyle 8\)

\(\displaystyle 6\)

\(\displaystyle 14\)

Correct answer:

\(\displaystyle 6\)

Explanation:

If each canoe requires an even number of campers, then it would have been impossible for 6 campers to have paddled across in all 4 canoes.

This is because if 6 campers used the canoes, 2 campers would have gone the first two canoes, while 1 camper would have gone in each of the 2 remaining canoes. Only having 1 camper per canoe would have been an odd number of campers, causing the canoe to be unbalanced.

6 campers:

Canoe 1 - 2, Canoe 2 - 2, Canoe 3 - 1, Canoe 4 - 1

In order for each canoe to have an even number of campers, there must be a minimum of 8 campers.

If there were 8 campers:

Canoe 1 - 2, Canoe 2 - 2, Canoe 3 - 2, Canoe 4 - 2

If there were 12 campers:

Canoe 1 - 2, Canoe 2 - 2, Canoe 3 - 2, Canoe 4 - 6

If there were 14 campers:

Canoe 1 - 2, Canoe 2 - 2, Canoe 3 - 4, Canoe 4 - 6

If there were 20 campers:

Canoe 1 - 4, Canoe 2 - 4, Canoe 3 - 6, Canoe 4 - 6

Example Question #11 : How To Find The Whole From The Part

Greg eats 4 brownies, which is equal to \(\displaystyle \frac{2}{17}\) of the total batch. How many brownies are in the total batch?

Possible Answers:

\(\displaystyle 34\)

\(\displaystyle 2\)

\(\displaystyle 17\)

\(\displaystyle 36\)

Correct answer:

\(\displaystyle 34\)

Explanation:

If b is equal to the number of brownies in the batch, the following equation can be used to determine the value of b:

\(\displaystyle \frac{2}{17}=\frac{4}{b}\)

Given that 4 is twice the value of 2, it follows that b will be twice the value of 17. Therefore, the value of b is 17 mutliplied by 2, which is 34. 

Example Question #93 : Isee Lower Level (Grades 5 6) Mathematics Achievement

There are four tea bags left in a box. If this quantity is 25% of the original, how many tea bags were originally in the box?

Possible Answers:

\(\displaystyle 18\)

\(\displaystyle 16\)

\(\displaystyle 20\)

\(\displaystyle 12\)

Correct answer:

\(\displaystyle 16\)

Explanation:

We can set up a proportion to solve:

\(\displaystyle \frac{4\ \textup{tea bags} }{x\ \textup{original tea bags}}=\frac{1}{4}\)

Cross-multiply:

\(\displaystyle x\ \textup{original tea bags}=4\times 4=16\ \textup{tea bags}\)

Example Question #94 : Isee Lower Level (Grades 5 6) Mathematics Achievement

What is the value of the expression below?

\(\displaystyle \frac{3(3+5)-6+9}{1+2}\)

Possible Answers:

\(\displaystyle 8\)

\(\displaystyle 9\)

\(\displaystyle 10\)

\(\displaystyle 7\)

Correct answer:

\(\displaystyle 9\)

Explanation:

To solve the expression, \(\displaystyle \frac{3(3+5)-6+9}{1+2}\), the key is to reduce it step by step, as shown below:

\(\displaystyle \frac{3(3+5)-6+9}{1+2}\)

\(\displaystyle \frac{3\cdot 8+3}{3}\)

\(\displaystyle \frac{24+3}{3}\)

\(\displaystyle \frac{27}{3}\)

\(\displaystyle 9\)

Example Question #13 : Whole And Part

What is the value of the expression below?

\(\displaystyle 14-7+(-7-3)+(2+5)-3\)

Possible Answers:

\(\displaystyle 5\)

\(\displaystyle 3\)

\(\displaystyle 1\)

\(\displaystyle 11\)

Correct answer:

\(\displaystyle 1\)

Explanation:

To solve \(\displaystyle 14-7+(-7-3)+(2+5)-3\), the expression must be reduced step by step, starting with the parentheses. 

\(\displaystyle 14-7+(-10)+(7)-3\)

\(\displaystyle 14-7-10+7-3\)

Negative 7 and positive 7 cancel each other out. 

\(\displaystyle 14-10-3\)

\(\displaystyle 1\)

Therefore, 1 is the correct answer. 

Example Question #11 : Whole And Part

If there are 4 servings in an ice cream container, and each serving is equal to 2 ounces, how many ounces are in the entire container?

Possible Answers:

\(\displaystyle 20\)

\(\displaystyle 2\)

\(\displaystyle 8\)

\(\displaystyle 4\)

\(\displaystyle 6\)

Correct answer:

\(\displaystyle 8\)

Explanation:

If an ice cream container has 4 servings and each serving is equal to 2 ounces, the total number of ounces in the container can be found by multiplying 2 by 4.

\(\displaystyle 2\times4=8\)

This results in 8 ounces. 

Example Question #12 : Whole And Part

If one-third of a pie is equal to 2 slices, how many slices are in the entire pie?

Possible Answers:

\(\displaystyle 4\)

\(\displaystyle 3\)

\(\displaystyle 5\)

\(\displaystyle 6\)

\(\displaystyle 8\)

Correct answer:

\(\displaystyle 6\)

Explanation:

We know that one-third of the pie is 2 slices. We can set up an equation:

\(\displaystyle \frac{1}{3}(\text{total pie})=2\)

In other words, one-third times the total slices in the pie will be equal to 2 slices.

Multiply both sides of the equation by 3.

\(\displaystyle \frac{1}{3}\times3\times(\text{total pie})=2\times3\)

The fraction on the left side cancels.

\(\displaystyle (\text{total pie})=2\times3=6\)

There are a total of 6 slices in the pie.

Example Question #103 : Isee Lower Level (Grades 5 6) Mathematics Achievement

If Gina makes a batch of cookies for her class. The class eats \(\displaystyle \frac{2}{3}\) of the cookies, and so \(\displaystyle 5\) remain. How many cookies were in the entire batch?

Possible Answers:

\(\displaystyle 10\)

\(\displaystyle 15\)

\(\displaystyle 5\)

\(\displaystyle 20\)

Correct answer:

\(\displaystyle 15\)

Explanation:

If the class eats \(\displaystyle \frac{2}{3}\) of the cookies and \(\displaystyle 5\) remain, this means that \(\displaystyle 5=\frac{1}{3}\). Therefore, \(\displaystyle \frac{2}{3}\) of the batch will be equal to \(\displaystyle 10\) cookies, as \(\displaystyle \frac{2}{3}\) is twice the value of \(\displaystyle \frac{1}{3}\), and \(\displaystyle 10\) is twice the value of \(\displaystyle 5\)

The entire batch of cookies will be equal to \(\displaystyle 5+10=15\).

Thus, \(\displaystyle 15\) is the correct answer. 

Example Question #13 : How To Find The Whole From The Part

If Andrew has coins in his wallet that add up to \(\displaystyle 66\) cents, which of the following is a possible combination of coins that he may have?

Possible Answers:

\(\displaystyle 1\) quarter, \(\displaystyle 3\) dimes, \(\displaystyle 4\) nickels, and \(\displaystyle 6\) pennies

\(\displaystyle 1\) quarter, \(\displaystyle 2\) dimes, \(\displaystyle 3\) nickels, and \(\displaystyle 6\) pennies

\(\displaystyle 2\) quarters, \(\displaystyle 2\) dimes, \(\displaystyle 3\) nickels, and \(\displaystyle 6\) pennies

\(\displaystyle 1\) quarter, \(\displaystyle 2\) dimes, \(\displaystyle 3\) nickels, and \(\displaystyle 1\) penny

Correct answer:

\(\displaystyle 1\) quarter, \(\displaystyle 2\) dimes, \(\displaystyle 3\) nickels, and \(\displaystyle 6\) pennies

Explanation:

The first step is to convert the coins into their values in cents. 

If we look at the combination of \(\displaystyle 1\) quarter, \(\displaystyle 2\) dimes, \(\displaystyle 3\) nickels, and \(\displaystyle 6\) pennies, the following expression can be used to determine the coins' value in cents:

\(\displaystyle 1\cdot 25+2\cdot 10+3\cdot 5+6\cdot 1\)

\(\displaystyle 25+20+15+6\)

\(\displaystyle 66\)

Therefore, the correct answer is \(\displaystyle 1\) quarter, \(\displaystyle 2\) dimes, \(\displaystyle 3\) nickels, and \(\displaystyle 6\) pennies.

As for the incorrect answers, \(\displaystyle 1\) quarter, \(\displaystyle 2\) dimes, \(\displaystyle 3\) nickels, and \(\displaystyle 1\) penny adds up to \(\displaystyle 61\) cents; \(\displaystyle 2\) quarters, \(\displaystyle 2\) dimes, \(\displaystyle 3\) nickels, and \(\displaystyle 6\) pennies adds up to \(\displaystyle 91\) cents; and \(\displaystyle 1\) quarter, \(\displaystyle 3\) dimes, \(\displaystyle 4\) nickels, and \(\displaystyle 6\) pennies adds up to \(\displaystyle 81\) cents.

Example Question #102 : Isee Lower Level (Grades 5 6) Mathematics Achievement

If Lisa buys a pair of shoes for \(\displaystyle \$50\), but the sales tax is \(\displaystyle 8\%\), what is the total cost of her shoes in dollars?

Possible Answers:

\(\displaystyle \$58\)

\(\displaystyle \$54\)

\(\displaystyle \$4\)

\(\displaystyle \$55\)

Correct answer:

\(\displaystyle \$54\)

Explanation:

If the sales tax is \(\displaystyle 8\%\), then this means that for every purchase of \(\displaystyle \$100\), an \(\displaystyle 8\%\) tax will be charged. 

Given that the shoes are \(\displaystyle \$50\) (half of \(\displaystyle \$100\)), half the sales tax of \(\displaystyle \$8\) should be charged, which is a value of \(\displaystyle \$4\)

Since \(\displaystyle 50+4=54\), the shoes will cost \(\displaystyle \$54\) after sales tax. 

Learning Tools by Varsity Tutors