All PSAT Math Resources
Example Questions
Example Question #491 : Arithmetic
Express as a decimal:
Divide 16 by 9:
The "7" repeats forever, so
Example Question #492 : Arithmetic
Express as a decimal:
Divide 9 by 16:
Example Question #493 : Arithmetic
Convert the fraction to a decimal.
We can multiply our numerator and denominator by , which leads to . From here we divide by our denominator, moving the decimal two places to the left.
Example Question #1 : Decimals
0.07
0.04
0.01
0.05
0.10
0.07
Multiply numerator by the other numerator and multiply the denominator by the other denominator for multiplication. To divide fractions, switch numerator and denominator and treat it as multiplication. The answer is 0.07.
Example Question #4 : Decimals With Fractions
Write 0.45 as a fraction.
.45 is equivalent to 45 out of 100, or .
Divide both the numerator and denominator by 5 to simplify the fraction:
Example Question #5 : Decimals
Express as a fraction:
Let
Then
and
Subtract:
Example Question #1 : How To Multiply Decimals
45.728 x 3.2 = ?
14.63296
14632.96
146.3296
146329.6
1463.296
146.3296
Multiply the numbers out in long format, then move the decimal point over the total number of decimal points in the two numbers (3 in the first, 1 in the second, so 4 total):
45.728 * 3.2 = 91456
91456 + 1371840 = 1,463,296 → 146.3296
Or just count the decimal points in the answer and make sure it's 4.
Example Question #1 : How To Multiply Decimals
At the farmer's market, oranges are $0.30 each, apples are $0.25 each, bananas are $0.40 each, and tomatoes are $0.60 each. If Scott buys 3 oranges, 7 apples, 4 bananas, and 8 tomatoes, how much does he spend?
$7.75
$10.40
$6.80
$11.40
$9.05
$9.05
To find out how much Scott spends, we need to multiply the quantity of each fruit by its price and add them all up.
3 * $0.30 + 7 * $0.25 + 4 * $0.40 + 8 * $0.60 = $9.05
Example Question #2 : How To Multiply Decimals
If is 25% of , what is the closest integer to the value of ?
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 #3 : How To Multiply Decimals
0.06
0.6
6
0.006
0.0006
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
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