Proportional Relationships
What is a proportion?
See Ms. Pedersen
What is the formula for calculating simple interest?
Interest = Principal x Rate x Time
What is the sum of 3/4 + 1/2?
1 1/4 or 5/4
What is 2/3 × 3/4?
6/12 = 1/2
If you have 20 apples and you give away 5, how many do you have left?
15
If 3 apples cost $2, how much do 9 apples cost?
$6
If you invest $200 at an interest rate of 5% for 3 years, how much interest will you earn?
$30
Subtract 2/3 − 1/6.
1/2
Divide 5/6 ÷ 1/3.
15/6 = 2 3/6 = 2 1/2
Solve: 4+3(2)−5.
5
Describe how to identify proportional relationships in a graph.
What is the total amount after earning simple interest on $500 at 4% for 2 years?
$540
How do you add rational numbers with different denominators?
Make common denominators!
How do you multiply rational numbers (fractions)?
Multiply across then reduce.
A store has a sale of 20% off an item originally priced at $50. What is the sale price?
$40
If the ratio of boys to girls in a class is 4:5, how many boys are there if there are 40 students total?
18
How does changing the interest rate affect the amount of simple interest earned?
lower rate, lower interest
If you have −5/8 + 3/4, what is the result?
1/8
What is the product of −2/5 × 3/7?
-6/35
If a car travels 60 miles per hour for 2.5 hours, how far does it travel?
150 miles
Explain the concept of unit rate with an example.
See Ms. Pedersen
If you borrowed $1,000 for one year at 6% simple interest, how much do you owe at the end of the year?
$1060
Explain how to simplify the result of 1/2 − 2/5 + 3/10.
2/5
If you divide 4/9 ÷ −2/3, what is the result?
-12/18 = -2/3
Solve the equation: 3x+4=19 for x.
x = 5