Practice the problems of Math in Focus Grade 5 Workbook Answer Key Chapter 10 Percent to score better marks in the exam.

## Math in Focus Grade 5 Chapter 10 Answer Key Percent

**Math Journal**

Arnold had dinner at a restaurant with his family. The dinner cost $72. In addition, he paid 7% meals tax on the dinner. How much did Arnold pay for the dinner?

Tyrone worked out the answer using his calculator like this:

93% × $72 = $66.96

Brandon worked out the answer using his calculator like this:

107% × $72 = $77.04

Whose answer is correct? Explain why his answer is correct.

Answer:

Brandon answer is correct

Explanation:

Arnold paid

7% of tax and 100% of his bill

107% × $72 = $77.04

or

Arnold paid

$72 + $7% = $72 + $5.04 = $77.04

**Put on Your Thinking Cap! **

**Challenging Practice**

**Solve. Show your work.**

Question 1.

Mr. Stanton bought a cell phone at 80% of the regular price. The regular price of the phone was $450. Mr. Wilson bought the same cell phone but paid $500 for it. How much more did Mr. Wilson pay than Mr. Stanton?

Answer:

140 more did Mr. Wilson pay than Mr. Stanton

Explanation:

Cell phone regular price is $450

Mr. Stanton paid 80% of 450 = $360

80% x $450= $360

Mr. Wilson paid $500

500 – 360 = 140

Mr. Wilson pay 140 more than Mr. Stanton.

Question 2.

Helen has 30 tickets. Gina has 20 more tickets than Helen. What percent of her tickets must Gina give Helen so that both of them have the same number of tickets?

Answer: 20%

Explanation:

Helen has 30 tickets.

Gina has 20 more tickets than Helen = 30 + 20 = 50 tickets

20 percent of her tickets must Gina give Helen so that both of them have the same number of tickets

such that both can have 40 tickets

Gina has 50 tickets

if she give 10 tickets to Helen ,now both are 40 tickets

20% of 50 is 10

**Put on Your Thinking cap!**

**Problem Solving**

**Solve. Show your work.**

Michelle collects U.S., Canadian, and Mexican stamps. In her collection, 80% of the stamps are U.S. and Mexican stamps. There are 3 times as many U.S. stamps as Mexican stamps. What percent of Michelle’s collection is made up of U.S. stamps?

Answer:

53.4%

Explanation:

100% of U.S. stamps + Canadian stamps + Mexican stamps

80% of the stamps are U.S. stamps + Mexican stamps

20% Canadian stamps

let Mexican stamp is x then

U.S stamps 3x

What percent of Michelle’s collection is made up of U.S. stamps?

80% —– 3X

? —– X

26.6 % Mexican

80% – 26.6% = 53.4%