PSAT Math : How to add decimals

Study concepts, example questions & explanations for PSAT Math

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Example Questions

Example Question #2089 : Psat Mathematics

If Johnny buys two comic books, priced at $1.50 each, and a candy bar, priced at $0.75, he'll have three quarters and two dimes left over.  How much money does he have right now?

Possible Answers:

$3.75

$3.20

$4.35

$5.10

$4.70

Correct answer:

$4.70

Explanation:

Add what he can purchase to what he has left over:

Two comic books and the candy bar: $1.50 + $1.0 + $0.75 = $3.75

Three quarters and two dimes: $0.75 + $0.20 = $0.95

Therefore his total amount of money is $3.75 + $0.95 = $4.70.

Example Question #2090 : Psat Mathematics

Possible Answers:

.2

.47

.37

2.0

.57

Correct answer:

.47

Explanation:

.3 can be written as .30. Now we can add the two more easily:

    

__________

    

 

Example Question #1 : How To Add Decimals

Menu

Above is the menu at a coffee shop.

Delia has a coupon that entitles her to a free butter croissant with the purchase of one large drink of any kind. The coupon says "limit one per coupon".

She decides to purchase two small espressos, two small cappucinos, and four butter croissants. Disregarding tax, how much will Delia spend?

Possible Answers:

Correct answer:

Explanation:

Delia will not use the coupon, since all four of her drinks are small. She will pay full price for:

Two small espressos: 

Two small cappucinos: 

Four butter croissants: 

The total price: 

Example Question #2 : How To Add Decimals

Find the sum.

Possible Answers:

Correct answer:

Explanation:

Example Question #3 : How To Add Decimals

Find the sum.

Possible Answers:

Correct answer:

Explanation:

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