Adding and Subtracting Fractions with Pictures & Numbers By Kathy Woodard 2012

Warm-up: Name, # and show your work. Write with the same denominator: 1. 2. 3. 4. Simplify this expression: 6. Put in descending order:

Key Words Add put different things together: sum, total, in all, combined, earn money, increase Subtract take away, OR find how much is left after, OR comparing how much more/less: difference, how much more, take away, give away, spent, decrease, money off of the price Multiply put same-size things together: # of, groups of, area (length x width), doubled = x2, tripled = x3 Divide cut into same-size groups: how many groups, the line in a fraction says divide, per, Round finding what it is close to: about, estimate, approximately, closest to

Add or Subtract? David measured 3/8 inch of rain Monday. He emptied the rain gauge and then measured 7/8 inch more rain on Tuesday. How much rain fell on both days combined?

Add or Subtract? David measured 3/8 inch of rain Monday. He forgot to empty the rain gauge. By Tuesday night there was 7/8 inch rain in the rain gauge. How much rain fell on Tuesday?

1. Add or Subtract? Jill and Sarah went panning for gold. Jill found 7/10 g of gold and Sarah found 6/10 g of gold. How much more gold did Jill find than Sarah?

2. Add or Subtract? Jill took her 7/10 g gold to the goldsmith and had jewelry made. The jewelry used 3/10 g of gold. How much gold was left over?

3. Add or Subtract? Hermione wants to use ribbon to make a border for her quilt. She has three pieces of ribbon: the first is 5/6 ft, the second is 4/6 ft, and the third is 3/6 ft. How long of a quilt border can she make?

4. Add or Subtract? Before Thanksgiving dinner we had a whole pumpkin pie. We ate 5/9 of the pie. How much pie do we have left?

When you add or subtract fractions they have to have the same denominators. Same Not the same!

Try Together

5. Addition or Subtraction? Tia and Mark each bought a chocolate bar. Tia ate 2/3 of her candy bar, and Mark ate 1/6 of his candy bar. How much more did Tia eat than Mark?

6. Addition or Subtraction? Muffin the kitten weighed 4 5 kg when she was born. She has since gained 1 2 kg. How much does she weigh now?

7. Add or Subtract? Jo has 2/3 of a yard of yarn and Kia has 1/4 of a yard. They need 1 yard for their project. Do they have enough?

8. Addition or Subtraction? Before Jeni started cooking she had 3/4 lb of chocolate chips. After she finished there was only 1/3 lb of chocolate chips left. How many pounds of chocolate chips did she use?

9. Addition or Subtraction? Rita drank 1/6 cup of lemonade. Then she drank 1/2 cup of water. How much liquid did Rita drink?

10. Addition or Subtraction? Joe had 5 6 L of motor oil, but then he used 1 2 L to fill up his engine. How much oil does Joe have left?

11. Add or Subtract?

12. Your Turn: One of Mrs. Woodard’s cookie recipes calls for 1 3/4 cups of flour. The other recipe calls for 2 3/4 cups of flour. How much flour will she need to make both recipes?

13. Don’t forget to simplify: Mina Mina

14. Addition or Subtraction? Abby buys 5 1/2 pounds of apples. She uses 2 1/4 pounds to bake a pie. How many pounds does she have left?

15. Addition or Subtraction? Tim mails two boxes of cookies to friends. One box weighs 1 3/4 pounds and the other weighs 2 2/3 pounds. What is the total weight of the two boxes?

16. Addition or Subtraction? Paul is 6 ¼ feet tall. Kathy is 5 ¾ feet tall. How much taller is Paul than Kathy?