SAT Math : Arithmetic
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Example Questions
Example Question #421 : Arithmetic
If 
We can approximate the value of y pretty quickly:
y ≈ 1(0.50)(52) = 26
Since y = 0.25x = (1/4)x we know that x = 4y ≈ 4(26) = 104
Example Question #422 : Arithmetic
0.006
6
0.0006
0.6
0.06
0.006
It's much easier to work with whole numbers, so we'll ignore the decimals for the first step: 5 x 12 = 60
Now look at the decimals. To add them back in, think of 60 as 60.0. Now move the decimal point four places to the left: 0.5 x 0.012 = .0060 = .006
Example Question #423 : Arithmetic
You bought a dozen eggs marked at 
Set the equation up as
Solve for 
or
Therefore the percent sales tax is:
Example Question #424 : Arithmetic
simplify: 0.2 ÷ 0.04
0.2 ÷ 0.04 <- easiest way to approach is to move the decimal to the right (the same amount of spaces on each side) so that the decimal disappears
since 0.04 has 2 spaces and 0.2 only has 1, move the decimal 2 spaces to the right on each side
0.2 ÷ 0.04 = 20 ÷ 4 = 5
Example Question #3 : Decimal Operations
If the cost of 20 equally priced pencils cost $5.80, then at the same rate what is the greatest number of pencils you can purchase for $50?
150
200
172.41
173
172
172
Remeber for this problem that you cannot spend more than $50. First find the price of each pencil by 5.80/20 = 29 cents. And then use this to do 50/0.29 = 172.41. So the greatest number of pencils you can purchase for $50 is 172 pencils.
Example Question #424 : Arithmetic
Charlie has charges on his credit card of $63.70, $37.32, and $81.78. If he pays down half his bill at once, and then pays the rest in four equal monthly installments, how much is each monthly installment?
Adding all the charges together and dividing by 2 yields $91.40. Dividing this by 4 yields a monthly installment of $22.85.
Example Question #425 : Arithmetic
Simplify:
Multiply both the numerator and denominator by some power of 10 to get rid of the decimals; in this case, multiply both by 10,000.
Example Question #1 : How To Order Decimals From Least To Greatest Or From Greatest To Least
Order the following decimals in order from least to greatest:
2.1, 6.9, 4.8, 5.2, 8.5
6.9, 4.8, 8.5, 5.2, 2.1
2.1, 4.8, 5.2, 6.9, 8.5
8.5, 6.9, 5.2, 4.8, 2.1
2.1, 5.2, 8.5, 4.8, 6.9
2.1, 4.8, 5.2, 6.9, 8.5
Look at the ones place first, ignoring the decimal. The order from greatest to least is 2, 4, 5, 6, and 8. Because none of the numbers in the ones place are the same, it doesn't matter what the decimal will be on these numbers- the order will remain the same. The order is 2.1, 4.8, 5.2, 6.9, 8.5.
Example Question #2 : How To Order Decimals From Least To Greatest Or From Greatest To Least
In the number 5,783.2935, what is the digit in the hundredths place?
The digit in the hundredths place is the one two decimal places to the right of the decimal. That digit is 9. Do not confuse the hundredths with the hundreds place, which is three spaces to the left of the decimal.
The answer is 9.
Example Question #3 : How To Order Decimals From Least To Greatest Or From Greatest To Least
Which of these decimals are the greatest?
look at the first decimal place; 0.2 and 0.201 are the largest.
0.2 = 0.200 and 0.201 > 0.200
0.201 is the greatest given decimal.
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