1. Adding and Subtracting Decimals

2. ***When adding or subtracting numbers with decimals you MUST …

3. Addition Example 1

4. Addition Example 2

5. You Try:

6. Addition Word Problem Example 1
Melissa wants to sew together three pieces of fabric to make a quilt. The lengths of the fabrics are 4.5cm, 3.75cm, and 12cm. What will be the total length of the quilt?

7. Subtraction Example 1
9.04 – 3.1

8. Subtraction Example 2
18.2 – 7.55

9. You Try:
367 –

10. Subtraction Word Problem
Sally and family went out to dinner. The bill came to a total of $35.76 including tax and tip. If Sally gave the waitress a $50 bill, how much change should she receive?

11. Practice with your partner
1.) Peter ran the mile in 7.4 minutes. If Jerry can run a mile in 6.8 minutes, how much faster is Jerry’s time than Peter’s?
2.) Keri has $ in her bank account. How much money does she have after she deposits a check for $86.92?

12. Practice with your partner
3.) In the morning William walked 3.2km to school. In the afternoon he walked 1.35km to his grandmother's house, and then 0.8km home again. How many total kilometers did he walk?
4.) Henry has two gerbils names Yip and Yap. If Yip weighs ounces, and Yap weighs ounces, how much heavier is Yip than Yap?

13. Practice with your partner
5.) A whippet can run a 200-yard course at a rate of 35.5 mi/h. This is 3.85 mi/h slower than the top speed of a greyhound. How fast can a greyhound run?
6.) Taylor has 2 rocks. If the total weight of both rocks is kg and the first rock weighs kg, how much does the second rock weigh?

14. Practice with your partner
7.) Renee finished her first lap in the 200 m freestyle event in secs. She completed the second lap in secs. By how much did her time increase in the second lap?
8.) Jack has 54 feet of edging to put around his triangular flower bed. If two sides of the flower bed are and 19.5 feet long, what is the length of the third side of the flower bed?

15. Practice with your partner
9.) Jen wants to make a bow for her hair and needs 8.3cm of ribbon. If her sister gave her a piece of ribbon that is 15cm long, how much extra ribbon does she have? Does she have enough to make two bows?
10.) Gem is making fruit punch. He has 4.6oz of grape juice, 5.92oz of apple juice, and 6oz of orange juice. If needs a total of 25oz of fruit punch, how much cranberry juice should he add?