Name: 
 

Lesson 6: Solving Problems that Involve Decimals



 1. 

Select the equivalent expression for the following:
     30% of $74.95
a.
0.30 mc001-1.jpg 74.95
b.
30 mc001-2.jpg 74.95
c.
0.30 mc001-3.jpg 74.95
d.
30 mc001-4.jpg 74.95
 

 2. 

Select the equivalent expression for 6.25%.
a.
0.0625
b.
0.625
c.
6.25
d.
62.5
 

 3. 

In Manitoba, the retail sales tax (RST) is 7%, and the goods and services tax (GST) is 5%. Calculate the total cost of a laptop computer that is on sale for $1789.89.
a.
$1915.18
b.
$1879.38
c.
$1811.37
d.
$2004.68
 

 4. 

Calculate the price of a new digital camera which is on sale for 15% off if the regular price of $169.95. Only the GST, 5%, is charged on this item.
a.
$144.46
b.
$151.68
c.
$152.95
d.
$147.59
 

 5. 

J.R. wants to buy a new sofa. One store is selling the sofa he wants for 20% off the regular price of $795.55. A second store is selling the same sofa for 15% off the regular price of $658.79. Which store has the better price?

The steps for solving this problem are shown. Select the step that contains the error.
a.
Calculate 20% of $795.55. This will be the amount J.R. will save on the sofa from the first store.
Calculate 15% of $658.79. This will be the amount J.R. will same on the sofa from the second store.
b.
Store 1: 0.20 mc005-1.jpg $795.55 = $159.11
Store 2: 0.15 mc005-2.jpg $658.79 = $98.82
c.
Store 1: $795.55 - $159.11 = $636.44
Store 2: $658.79- $98.82 = $559.97
d.
Since J.R will save more money if he buys the sofa at Store 1, the store that is selling the sofa at the best price is Store 1.
 

 6. 

How much money will Katie earn in interest if she invests $5000 that pays 4.25% simple interest for 5 years? Select the best expression to begin to solve this problem.
a.
4.25 mc006-1.jpg $5000
c.
0.425 mc006-3.jpg $5000
b.
0.0425 mc006-2.jpg $5000
d.
425 mc006-4.jpg $5000
 

 7. 

Determine how much Katie’s investment, from question 6, will be worth in 5 years.
a.
$6062.50
b.
$3937.50
c.
$5212.50
d.
$4787.50
 

 8. 

Garry’s Electronic store is having a “NO GST” sale, where any purchase will have the PST of 7% added to the total. How much will Pamela pay for a plasma T.V. if the price of the T.V. is $1259.95?
a.
$88.20
b.
$1171.75
c.
$1348.15
d.
$2141.92
 

 9. 

A mountain bike is on sale for 30% off the regular price of $379.69. Calculate the purchase price if the taxes amount to 5%.
a.
$113.91
b.
$398.67
c.
$265.78
d.
$279.07
 

 10. 

Stephan works at a music store. He is paid $185 a week, plus 8% of the value of his sales for the week. Last week, his sales totalled $428.56. What were his total earnings for the week?
a.
$647.84
b.
$462.84
c.
$329.45
d.
$219.28
 



 
Check Your Work     Start Over