#### Transcript Adding and Subtracting Fractions (ppt)

Adding and Subtracting Fractions with Pictures & Numbers By Kathy Woodard 2012 Write with the same denominator: 1. 3 3. 4 2. 2 Write with the same denominator: 3 4. 12 5. Simplify this expression: 2(3 1) 2 12 1 5 6 6. Put in descending order: 2 7 7 2 0 100% , 6 5 , 5 6 Key Words Add put different things Subtract take away, OR together: sum, total, in all, combined, earn money, increase 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 Divide cut into same-size things together: # of, groups of, area (length x width), doubled = x2, tripled = x3 groups: how many groups, the line in a fraction says divide, per, Round finding what it is close to: closest to about, estimate, approximately, 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. 2 7 3 7 3 8 1 6 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? 4 5 Muffin the kitten weighed kg when she 1 2 was born. She has since gained 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? 5 6 Joe had L of motor oil, but then he 1 2 used 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?