2nd Grading Period Review

2nd Grading Period Review

by E G

Multiplying and Dividing Fractions

Multiplying Fractions

This is the easy one. If fact, you've already done it when you were adding fractions and finding a common denominator.

When multiplying fractions, just multiply straight across. Numerator times numerator. Denominator times denominator. That's it.

Multiple Choice

What's the rule for multiplying fractions?

• Just multiply straight across.

• Keep, Change, Flip

• You must have a common denominator

Multiple Choice

Find the product in simplest form.

5/6 x 3/4=

• 15/24

• 5/8

• 8/10

• 4/5

Multiple Choice

What is the product of  $$1\frac{5}{8}$$  and  $$\frac{4}{3}$$  ?  $$1\frac{5}{8}\cdot\frac{4}{3}=\frac{13}{8}\cdot\frac{4}{3}=?$$  

• $$\frac{17}{11}$$  

• $$\frac{9}{5}$$  

• $$\frac{52}{24}$$  

• $$\frac{39}{32}$$  

Multiple Choice

$$\frac{1}{4}\times\frac{1}{6}=$$  ? Remember to simplify.

• 2/3

• 3/2

• 1/24

• 24

Dividing Fractions

Rule#1 for Dividing Fractions: DON'T DIVIDE.

Instead of dividing you do this procedure:

KEEP, CHANGE, FLIP

Dividing Fractions

Multiple Choice

When dividing fractions, what rule do we use?

• Keep, Change, Flip

• Multiply straight across

• Must have a common denominator

Multiple Choice

After I "Keep, Change, Flip" what equation would I have? $$\frac{1}{2}\div\frac{2}{5}$$  

• $$\frac{2}{1}\times\frac{2}{5}$$  

• $$\frac{1}{2}\times\frac{5}{2}$$  

Multiple Choice

Simplify $$\frac{3}{8}\div\frac{2}{3}$$  

• $$\frac{9}{16}$$  

• $$\frac{6}{24}$$  

• $$\frac{1}{4}$$  

• $$\frac{3}{8}$$  

Multiple Choice

1 ¼ × 2 ¾ =

• 3 ⁷/₁₆
• 1 ¹/₂
• 2 ³/₁₆
• 4 ¹/₄

Multiplying and Dividing Decimals

• The number with the most digits goes on top

• Decimals do not have to line up

• Multiply like normal

• Count how many places in the first number the decimal is moved over

• Count how many places in the 2nd number the decimal is moved over

• This is how many places you move the decimal in your answer

• Divisor cannot have a decimal

• Move the divisor decimal so it is a whole number

• Move the same amount of places in the dividend

• Place a decimal straight up where you write your answer 

• Divide like normal

Multiple Choice

Place the decimal into this number:

2.39 x 4.37 = 104443

• 10.4443

• 104.443

• 10444.3

• 1.04443

Multiple Choice

Oliver bought 7 bags of candy and each bag costs $3.49. The tax was $2.02. How much money did he have to pay?

• $22.41
• $24.43
• $26.45

Rates & Unit Rates

Multiple Choice

$$\ \frac{65\ miles}{3\ hours}$$  Is this a rate or a unit rate?

• rate

• unit rate

Multiple Choice

$$\frac{3\ pages}{1\ \min ute}$$  Is this a rate or a unit rate?

• rate

• unit rate

Multiple Choice

Sargento cheese slices $2.48 for 10 slices
or
Velveeta Cheese slices $3.18 for 12 slices
Find the unit price for each and choose the better deal.

• Sargento
• Velveeta

Multiple Choice

Which is the better deal?
Oreos
$2.98 for 15 oz
OR
Chips Ahoy
$2.50 for 14 oz

• Oreos
• Chips Ahoy

Multiple Choice

You spend $40 on 5 pounds of concrete. What is the unit rate in dollars per pound?

• $8 per pound
• $5 per pound
• $35 per pound
• 0.125 pounds per dollar

Multiple Choice

If there are 5 soccer players, 10 baseball players, and 15 basketball players, what is the ratio of baseball players to soccer players?

• 1 to 2
• 1 to 3
• 2 to 1
• 3 to 1

Multiple Choice

Which rate is equivalent to 15 miles per hour?

• 30 miles in 3 hours
• 30 miles in 2 hours
• 30 miles in 5 hours

Multiple Choice

Jose swims 3 laps in a pool every 2 minutes. How long would it take him to swim 27 laps?

• 8 minutes
• 9 minutes
• 16 minutes
• 18 minutes

Multiple Choice

An airplane travels 2,827 miles in 5.5 hours. What is the speed of the airplane in miles per hour? Use d=rt.

• 541 mph
• 514 mph
• 451 mph
• 415 mph

Multiple Choice

 A scientist conducting a dig spent $37.95 on 23 packets of hand wipes for her team of volunteers. What was the price of each packet?

• $16.50 
• $16.05 
• $1.60
• $1.65