All ACT Math Resources
Example Questions
Example Question #1 : How To Add And Subtract Decimals
Subtract:
Rewrite adding the correct number of placeholders and evaluate.
Example Question #2 : Fluently Add, Subtract, Multiply, And Divide Multi Digit Decimals: Ccss.Math.Content.6.Ns.B.3
If Exam 1 is worth 25% of the total grade, Exam 2 is worth 25% and Exam 3 is worth 50%, what is Dave’s final grade?
82
84
85.75
83.5
79
84
Final Grade = Exam1 * 0.25 + Exam 2 * 0.25 + Exam3 * 0.50 =
96*0.25 + 70*0.25 + 85*0.5 =
24 + 17.5 + 42.5 = 84
Example Question #11 : Other Decimals
A chemistry students needs to dilute some acid. How much water should be added to 2 L of 80% acid solution to yield 50% acid solution?
1.2 L
1.5 L
0.8 L
1.0 L
2.0 L
1.2 L
Pure water would be 0% solution and pure solution would be 100%
V1P1 + V2P2 = VfPf
Let x = amount of water to add
x(0) + 2(0.80) = (x + 2)(0.50) which when solved gives x = 1.2 L
Example Question #2 : How To Multiply Decimals
Kevin is looking at the blueprint of the house he is building. The scale is 1 inch = 5 feet. On paper, the master bedroom is 2.5 inches by 3 inches. What is the actual size of the bedroom?
12.5 ft x 15 ft
10 ft x 10 ft
20 ft x 30 ft
15 ft x 25 ft
7.5 ft x 9 ft
12.5 ft x 15 ft
The given dimensions must be multiplied by 5, so 2.5 inches becomes 12.5 feet, and 3 inches becomes 15 feet.
Example Question #13 : Hspt Mathematics
If , approximately how many inches are in one meter?
and
Using the factor-label method we get the following equation.
We treat the units as if they are numbers, and can cancel the units from the fractions.
Example Question #1 : How To Multiply And Divide Decimals
A car has gas mileage of 46 miles per gallon. Assume that gas costs $3.90 per gallon. What would be the total cost of gas if the car traveled 1,150 miles?
$100.00
$115.60
$179.40
$97.50
$125.70
$97.50
First find out how many gallons of gas the car consumed while traveling 1150 miles. This can be found out like so:
1150 miles x gallons/46 miles = 25 gallons
Multiplying 25 by $3.90 yields $97.50.
Example Question #1 : How To Multiply Decimals
Evaluate
First,
Then,
Example Question #1 : How To Multiply Decimals
You bought a dozen eggs marked at and received
change from
. What is the percent of sales tax?
Set the equation up as
Solve for , which equals
or
Therefore the percent sales tax is:
Example Question #21 : Other Decimals
What is ?
0.625 is equal to , while .25 is equal to
. Dividing by fractions is the same as multiplying by the reciprocal of the divisor. Thus,
which equals
, which simplifies to 2.5.
Example Question #1 : How To Divide Decimals
Divide:
Eliminate the decimal place on the denominator by moving the decimal place 2 spaces to the right. Follow suit for the numerator. The decimal place should also move the same number of units to the right. Evaluate.
Certified Tutor
Certified Tutor
All ACT Math Resources
