| Math Check Solutions
Chapter 1
Chapter 2
Chapter 3
Chapter 4
Chapter 5
Chapter 6
Chapter 7
Chapter 8
Chapter 9
Chapter 10
Chapter 11
Chapter 12
Chapter 13
Chapter 14
Chapter 15
Chapter 16
Chapter 1
Goods and Services
Calculate a retail purchase: You just bought a new bicycle
for $250 plus 8 percent sales tax. Assembly costs $35. What
is your total bill?
Answer: $250 × 1.08 = $270; $270
+ 35 = $305 total
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Chapter 2
Toy Store
Rita just opened her own toy store. Her start-up costs were
$25,020. Her rent and monthly expenses for the first year
will be $30,000. How much will she need to make per month
in the first year to cover these costs?
Answer: $25,020 + $30,000 = $55,020; $55,020
÷ 12 = $4,585
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Chapter 3
The Best Choice
Hideo would like to buy a new stereo. He sees two ads for
stereos in the newspaper. The warehouse store has the model
he wants for $115.99. The department store has the same model
at $139, but all stereos are 20 percent off this week. Which
store should he go to for the best deal?
Answer: $139 x .20 = $27.80; $139 - $27.80
= $111.20; the department store
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Chapter 4
Home Earnings
Yolanda hosted a party for a company that sells decorative
candles at home parties. She received a 30 percent discount
on all candles as compensation. She bought holiday gifts totaling
$362. What amount did she have to pay including 8 percent
sales tax?
Answer: $362.00 x .30 = $108.60; $362.00
- $108.60 = $253.40; $253.40 x .08 = $20.27; $253.40 + $20.27
= $273.67
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Chapter 5
Retail Culture
Alita makes salsa to sell at Peruvian Culture Night at her
school. She buys the salsa ingredients for $25.09, and two
boxes of containers for $3.29 each. She sells each container
of salsa for $3.75. She sells 23 salsa containers. How much
profit has she made?
Answer: $25.09 + [$3.29 × 2] - $31.67;
$3.75 × 23 = $86.25 - $31.67 = $54.58
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Chapter 6
Turning It Over
Thahn’s watch store just celebrated one year in business.
Thahn wants to know the stock-turnover rate for six months
to check his progress. Over 12 months, his sales totaled $156,000.
His average inventory on hand totaled $68,000. What was the
rate?
Answer: $156,000 ÷ $68,000 = 2.29
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Chapter 7
Open-to-Buy
Ayesha is running a beach shop. In June, her planned purchases
total $3,300. She’s ordered merchandise that costs $1,400
and received a shipment of goggles for $300. What is her open-to-buy
figure?
Answer: $3,300 - ($1,400 + 300) = $1,600
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Chapter 8
Rent or Buy?
Tera is about to open a motorcycle shop. He must choose between
a space for rent or a small building for sale. The rent is
$1,200 per month, but he cannot make any improvements. The
monthly payment for the building would be $800, but he must
pay taxes and extra insurance at $300/month. What is the better
monthly rate?
Answer: Rent = $1,200; Buy = $800 + $300
= $1,100. Buying gives the better monthly rate.
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Chapter 9
Impulsive Budget
Donovan went grocery shopping with $55. His total bill was
$53.50, but he noticed a special on candy bars as he was checking
out: three for $2.50. Did he have enough money to buy the
candy too?
Answer: $53.50 + $2.50 = $56; $56 - $55
= $1. Donovan was short $1.
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Chapter 10
Mega-Gem
How much does the 3,107-carat Star of Africa diamond weigh
in grams if one carat equals .2 grams?
Answer: 3,107 × .2 = 621.4 grams
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Chapter 11
Add It Up
Once a week, Tasca teaches karate to 31 students in a 90-minute
class for $23 per person. She was able to “sell”
11 students on taking weekly private lessons at $55 per lesson.
How much does Tasca receive each week?
Answer: 31 × $23 = $713; 11 ×
$55 = $605; $713 + $605 = $1,318
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Chapter 12
Bonus Time
Livian has sold $2,320 worth of merchandise. How much will
her commission be if she gets a 20 percent commission plus
5 percent more on amounts over $1000?
Answer: $2,320 × .2 = $464; $2,320
- $1,000 = $1,320; $1,320 × .05 = $66; $464 + $66 =
$530
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Chapter 13
Measuring Markdowns
Lois marks down all Halloween merchandise by 40 percent. How
much would her shop take in if she sold 35 jack-o-lanterns
originally priced at $9.95 and 50 ghosts originally priced
at $14.95?
Answer: $9.95 × .4 = $3.98; $9.95
- $3.98 = $5.97; $5.97 × 35 = $208.95
$14.95 × .4 = $5.98; $14.95 - $5.98 = $8.97 ×
50 = $448.50 + $657.45 = $1,105.95
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Chapter 14
Calculate Job Decline
According to the U.S. Department of Labor, 148,000 people
are employed as buyers – a job sector that is declining.
If that career declines at a rate of two percent per year,
how many buyers will be employed in three years? (Round up
all fractions in your calculations).
Answer: 148,000 × .02 = 2,980; 148,000
- 2,980 = 145,020; 145,020 × .02 = 2,900; 145,000 –
2,900 = 142,120; 142,120 x .02 = 2,842; 142,120 – 2,842
= 139,278
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Chapter 15
Comparing Paychecks
Jonas has been working at a toy store and earns $8 per hour.
During the school year, he worked 20 hours a week. Now that
school has ended, he will work 35 hours per week. How much
more money will Jonas earn each week over the summer than
he did each week during the school year?
Answer: 20 × $8 = $160; 35 ×
$8 = $280; $280 - $160 = $120 more per week
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Chapter 16
Living Wages
Larissa is applying for two entry-level jobs. One pays $9.50
an hour for 35 hours a week. The other pays $8.50 an hour
for 40 hours a week. Which job would give Larissa more income
each week?
Answer: $9.50 × 35 = $332.50; $8.50
× 40 = $340; 40 hours at $8.50 gives Larissa more income.
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