PSAT Math : Arithmetic

Study concepts, example questions & explanations for PSAT Math

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Example Questions

Example Question #1 : How To Order Decimals From Least To Greatest Or From Greatest To Least

Menu

Five friends go to a coffee shop, the menu for which is above. Each has a coupon that is good for one dollar off the price of a butter croissant with the purchase of a large drink, or fifty cents off the price of a butter croissant with the purchase of a small drink.

Mick buys one large iced coffee and one butter croissant.

Keith buys one small iced coffee and one butter croissant.

Bill buys one large cappucino and one butter croissant.

Charlie buys one small cappucino and one butter croissant.

Brian buys two butter croissants.

Who will pay the most, if everyone who can use his coupon does?

Possible Answers:

Keith

Mick

Charlie

Bill

Brian

Correct answer:

Bill

Explanation:

Mick orders a large drink, so he uses his coupon to save a dollar off his croissant. He will pay

Bill orders a large drink, so he uses his coupon to save a dollar off his croissant. He will pay

Keith orders a small drink, so he uses his coupon to save fifty cents off his croissant. He will pay

Charlie orders a small drink, so he uses his coupon to save fifty cents off his croissant. He will pay

Brian does not buy a coffee, so he will not use his coupon. He will pay full price for both croissants, which will be

Bill pays the most.

Example Question #1 : How To Order Decimals From Least To Greatest Or From Greatest To Least

What is the median of the following numbers: , , , , and ?

Possible Answers:

Correct answer:

Explanation:

The median of a given set of numbers is the number that occurs precisely in the middle of all the numbers when they are put in numerical order. Thus, in order to find the median of this set of numbers, you must first put then in order from least to greatest, then find the number in the middle (the third number, in this set of five).

Numerical order for these numbers is:

2.74, 3,33, 3.45, 3.56, 3.89

Thus, the median is 3.45.

Example Question #531 : Arithmetic

Simplify. Assume all integers are positive real numbers.

Possible Answers:

Correct answer:

Explanation:

There are two ways to solve this problem.

First, leave the question in decimal form.

Second, put your question in fraction form. 

Example Question #1 : Basic Squaring / Square Roots

If all real values of x lie between 0 and 1, which of the following is always greater than 1?

Possible Answers:

x^{2}

5x^{2}

x+1

\frac{x}{10}

x^{4}

Correct answer:

x+1

Explanation:

If x is greater than 0, then adding 1 to x will make it greater than 1. Taking a number between 0 and 1 to a power results in a smaller number.

Example Question #2 : Basic Squaring / Square Roots

Evaluate:

0.082

Possible Answers:

0.0064

0.00064

0.00064

0.64

0.064

Correct answer:

0.0064

Explanation:

0.08 * 0.08

First square 8:

8 * 8 = 64

Then move the decimal four places to the left:

0.0064

Example Question #1 : Solving Word Problems With Multiple Unit Conversions

How many  are in 

Possible Answers:

Correct answer:

Explanation:

To solve this problem we can make proportions.

We know that  and we can use  as our unknown. 

Next, we want to cross multiply and divide to isolate the  on one side. 

The  will cancel and we are left with 

Example Question #2 : Solving Word Problems With Multiple Unit Conversions

How many  are in 

Possible Answers:

Correct answer:

Explanation:

To solve this problem we can make proportions.

We know that  and we can use  as our unknown. 

Next, we want to cross multiply and divide to isolate the  on one side. 

The  will cancel and we are left with 

Example Question #1 : Solving Word Problems With One Unit Conversion

A carpenter is making a model house and he buys  of crown moulding to use as accent pieces. He needs  of the moulding for the house. How many feet of the material does he need to finish the model?

Possible Answers:

Correct answer:

Explanation:

We can solve this problem using ratios. There are  in . We can write this relationship as the following ratio:

We know that the carpenter needs  of material to finish the house. We can write this as a ratio using the variable  to substitute the amount of feet.

Now, we can solve for  by creating a proportion using our two ratios.

Cross multiply and solve for .

Simplify.

Divide both sides by .

Solve.

Reduce.

The carpenter needs  of material.

Example Question #2 : Solving Word Problems With One Unit Conversions

A carpenter is making a model house and he buys  of crown moulding to use as accent pieces. He needs  of the moulding for the house. How many feet of the material does he need to finish the model?

Possible Answers:

Correct answer:

Explanation:

We can solve this problem using ratios. There are  in . We can write this relationship as the following ratio:

We know that the carpenter needs  of material to finish the house. We can write this as a ratio using the variable  to substitute the amount of feet.

Now, we can solve for  by creating a proportion using our two ratios.

Cross multiply and solve for .

Simplify.

Divide both sides by .

Solve.

Reduce.

The carpenter needs  of material.

Example Question #2101 : Psat Mathematics

A carpenter is making a model house and he buys  of crown moulding to use as accent pieces. He needs  of the moulding for the house. How many feet of the material does he need to finish the model?

Possible Answers:

Correct answer:

Explanation:

We can solve this problem using ratios. There are  in . We can write this relationship as the following ratio:

We know that the carpenter needs  of material to finish the house. We can write this as a ratio using the variable  to substitute the amount of feet.

Now, we can solve for  by creating a proportion using our two ratios.

Cross multiply and solve for .

Simplify.

Divide both sides by .

Solve.

Reduce.

The carpenter needs  of material.

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