7th Grade Add/Subtract Rational Numbers Review Lesson

​Review of Add/Subtract Rational Numbers

By Chip Krolik

Let's review with fractions

Multiple Choice

To add two fractions, I need a...

• common denominator

• multiply by the reciprocal

• keep, change, flip

• extra help

Match

Simplify and Match.

• $$\frac{30}{50}$$

• $$\frac{42}{48}$$

• $$\frac{8}{12}$$

• $$\frac{12}{24}$$

• $$\frac{27}{36}$$

• $$\frac{3}{5}$$

• $$\frac{7}{8}$$

• $$\frac{2}{3}$$

• $$\frac{1}{2}$$

• $$\frac{3}{4}$$

Multiple Choice

$$-3\ \frac{1}{6}\ +\ 5\ \frac{3}{5}$$   

• 2 13/ 30

• -2 13/30

• 1 13/30

• -1 13/30

Multiple Choice

Add

$$\frac{2}{3}+\frac{4}{5}$$  

• $$\frac{22}{15}$$  

• $$\frac{6}{8}$$

• $$\frac{8}{15}$$  

• $$\frac{6}{15}$$  

Math Response

Bob has a stamp collection. He wrote down what states the stamps are from.

⅙ from Indiana 

⅓ from California 

⅓ from South Dakota 

⅙ from Florida

What fraction of Bob’s stamps came from California, Florida, AND Indiana?

Type answer here

Correct Answer: \frac{2}{3}

Deg^°

Rad

Multiple Choice

 5/8 − (− 7/8)

• 1  1/2
• 2  1/2
• -1  1/2
• -2  1/2

Multiple Choice

$$\frac{2}{3}-\frac{6}{9}$$  

• $$\frac{12}{27}$$  

• $$\frac{4}{9}$$

• $$\frac{8}{12}$$  

•   $$0$$   

• none of these

Multiple Select

$$\frac{4}{5}-\frac{2}{3}$$  

• $$\frac{6}{14}$$  

• $$\frac{6}{5}$$  

• $$\frac{2}{15}$$  

• $$-\frac{10}{36}$$  

Multiple Choice

-½ + -⅔

• 3/5
• -1 1/6
• 1
• 3/5
• 1 1/6

Multiple Choice

Juaqine plans to make three different kinds of cookies. The amount of sugar required for each kind of cookie is shown below.

Chocolate chip: 1 1/4 cups

Oatmeal raisin: 2/3 cup

Peanut butter: 1/2 cup

How much sugar does Juaqine need to complete all three recipes?

• 1 $$\frac{4}{9}$$  

• 1 $$\frac{7}{12}$$  

• 2 $$\frac{1}{3}$$  

• 2 $$\frac{5}{12}$$  

• none of these

Multiple Choice

Jim biked 2 1/4 on Monday and 3 5/8 on Tuesday. How much further did he travel on Tuesday than on Monday?

• 5 7/8

• 1 1/2

• 1 3/8

• 1 5/8

Multiple Choice

What is the value of the following expression?

• -12 and 19/21

• -12 and 1/2

• -2 and 3/4

• -2 and 5/21

Review Integers Rule

Multiple Choice

When adding decimals with the same sign you.....

• subtract and take the sign of the larger number
• add the opposite
• add and keep the sign
• subtract and keep the sign

Multiple Choice

When adding decimals with different signs you....

• subtract and take the sign of the larger number
• add the opposite
• add and keep the sign
• subtract and keep the sign

Multiple Choice

5.37 - 9.25 =

• -4.12

• 4.12

• 3.88

• -3.88

Multiple Choice

Solve

-5.66 - (-4.1)

• -2.56
• -1.56
• -9.76

• 1.56

• none of these

Multiple Choice

Find 6.23 - 7.5

• -13.73

• 1.3

• -1.27

• 1.27

Poll

After this review, I feel --- about +/- rational numbers

• very confident

• good

• eh, so-so, I guess.

• lost! I don't know any of this stuff!

• other: my thoughts/feelings are not listed here