Adding Rational Numbers

Adding Rational Numbers

Math 7

Adding Decimals Review

Think way back...

Multiple Choice

5.6 + 0.76 =

• 13.2

• 1.32

• 6.36

• 63.6

Multiple Choice

45 + 6.5

• 1.1

• 110

• 11

• 51.5

Multiple Choice

12.9 + 2.9

• 15.8

• 12.8

• 15.0

• 7.9999

Steps for adding and subtracting Decimals

Don't forget to STACK your decimals and add zeros when needed.

Multiple Choice

What is the sum of 46.19 + 82.10=?

• 128.29

• 138.29

• 148.29

• 118.29

Multiple Choice

0.3 + 0.14 =

• 0.17

• 0.314

• 0.43

• 0.44

Multiple Choice

What is the sum of 46.19 + 82.10=?

• 128.29

• 138.29

• 148.29

• 118.29

Adding Fractions

recall from years past

Multiple Choice

How do I add this fraction? 

• 11/15
• 3/8
• 3/15
• 11/8

Multiple Choice

How do I add this fraction? 

• 5/8
• 20/32
• 4/12
• 8/5

Multiple Choice

How do I add this fraction?

• 9/9

• 8/9

• 7/81

• 20/9

Multiple Choice

How do I add this fractions?

• 6/6

• 6/12

• 5/6

• 6/36

Steps to Adding (And Subtracting) Fractions

• If the denominators are the same, add the numerators and simplify.

• If the denominators are different (unlike), find the LCD of both numbers, multiply the fractions, add, and then simplify.

Multiple Choice

What would be the least common denominator for when you add 1/3 and 5/6?

• 3
• 6
• 9
• 12

Multiple Choice

Add.
4/7 + 3/5

• 7/35
• 1  6/35
• 16/35
• 40/35

Multiple Choice

Find the sum.
1/2 + 2/5

• 3/7
• 3/10
• 9/10
• 1  1/10

Adding Integers Review

Let's see what we remember!

Multiple Choice

8 + (-2)

• 10

• 6

• -10

• -6

Multiple Choice

-5 + 9 = ?

• -4
• 4
• -14
• 14

Multiple Choice

-4 + (-3) = ?

• 7
• 1
• -1
• -7

Adding Integers Review

• If the signs are the same, add as normal and keep the sign.

• If the signs are different, subtract and take the sign of the bigger absolute value.

Adding Rational Numbers with Integers

Now, we will combine everything we learned.

Adding Decimals with Integers

• Line up your Decimals

• If the integers are the same, you add like normal and bring through your signs.

• If the integers are different, then subtract and take the sign of the bigger number. And follow your decimals to the bottom.

Adding Fractions with Integers

• If the integers are the same, make sure or change your denominators to the same. Add and keep the signs.

• If the integers are different, change your denominators, and subtract your numerators and keep the sign of the bigger absolute value.

Multiple Choice

- 5/6 + - 3/8

• 8/14
• - 8/14
• - 29/ 24 (or -1   5/24) 
• 29/ 24 (or 1   5/24) 

Multiple Choice

- 1/4 + - 2/4 

• - 3/8
• 3/8
• 3/4
• - 3/4

Multiple Choice

- 43 + - 4.23

• 47.23
• -4.66
• -47.23
• -8.53

Multiple Choice

- 4.3 + - 82.19

• 86.49
• 82.92
• -86.49
• -82.92

Questions?

Do you need anything cleared up?