Presentation on theme: "Adding and Subtracting Fractions with Pictures & Numbers By Kathy Woodard 2012."— Presentation transcript:
Adding and Subtracting Fractions with Pictures & Numbers By Kathy Woodard 2012
Write with the same denominator: 1. 2. Write with the same denominator: 3. 4. 5.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.
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? 7. Add or Subtract?
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?