Subtraction with Unequal Denominators. How can you use models to subtract fractions that have unequal denominators?

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1 ? Name. Essential Question Subtraction with Unequal enominators How can you use models to subtract fractions that have unequal denominators? Number and Operations..H,..K MTHEMTIL PROESSES.1. Investigate Hands On Mario fills a hummingbird feeder with _ cup of sugar water on Friday. On Monday, Mario sees that cup of sugar water is left. How much sugar water did the hummingbirds drink? Materials fraction strips Mathoard. Find _. Place three Mathoard. Then place a strips under the 1-whole strip on your strip under the strips.. Find fraction strips all with the same denominator that fit exactly under the difference _.. Record the difference. raw onclusions _ = _ So, the hummingbirds drank _ cup of sugar water. Math Talk Mathematical Processes How can you tell if the difference of the fractions is less than 1? Explain. 1. escribe how you determined what fraction strips, all with the same denominator, would fit exactly under the difference. What are they?. Explain whether you could have used fraction strips with any other denominator to find the difference. If so, what is the denominator? Module 01

2 Make onnections Sometimes you can use different sets of same-denominator fraction strips to find the difference. ll of the answers will be correct. Hands On Solve. Find fraction strips, all with the same denominator, that fit exactly under the difference _. Find another set of fraction strips, all with the same denominator, that fit exactly under the difference _. raw the fraction strips you used. Find other fraction strips, all with the same denominator, that fit exactly under the difference _. raw the fraction strips you used. _ = = = _ While each answer appears different, all of the answers can be simplified to _. Share and Show Math Talk Mathematical Processes Which other fraction strips with the same denominator could fit exactly in the difference of _? Use fraction strips to find the difference. Write your answer in simplest form _ = _ Use fraction strips to find the difference. Write your answer in simplest form. 0 _ = _. _ = = _. _ 7 1 = _

3 Name Unlock the Problem. Multi-Step The picture at the right shows how much pizza was left over from lunch. Jason eats of the whole pizza for dinner. Which subtraction sentence represents the amount of pizza that is remaining after dinner? 1 = = = _ 1 _ = _ a. What problem are you being asked to solve? b. How will you use the diagram to solve the problem? c. Jason eats of the whole pizza. How many slices does he eat? d. Redraw the diagram of the pizza. Shade the sections of pizza that are remaining after Jason eats his dinner. e. Write a fraction to represent the amount of pizza that is remaining. _ f. Fill in the bubble for the correct answer choice above. 7. Explain how a model for _ is different from a model for _ 10. Module Lesson 0

4 aily ssessment Task Mathematical Processes Fill in the bubble completely to show your answer.. You are making cranberry lemonade for the Tastiest everage contest. You use 10 liter cranberry juice and liter lemonade. You drink 1 10 liter, just to be sure that it tastes delicious! How much cranberry lemonade do you have left? 10 liter 11 liter 9 10 liter 10 liter 9. Use iagrams alvin used fraction strips correctly to model the difference of 1. Which of these describes his model? seven 1 1 strips, one strip, two strips seven 1 1 strips, one strip, one strip seven 1 1 strips, two strips, one strip seven 1 1 strips, one strip, one strip 10. Multi-Step ethany made her pple Surprise drink by mixing pint lemon juice, pint grape juice, and _ pint apple juice. She then drank pint of the mixture. How much pple Surprise was left? pint pint pint _ pint TEXS Test Prep 11. The diagram shows what Tina had left from a yard of fabric. She now uses _ yard of fabric for a project. How much of the original yard of fabric does Tina have left after the project? 0 yard _ yard yard yard

5 Homework and Practice Name Number and Operations..H,..K MTHEMTIL PROESSES.1.. Subtraction with Unequal enominators Use fraction strips to find the difference. Write your answer in simplest form. 1..?? = _ 11 1 = _. = _ = _ = _. = _ = _. 1 = _ = _ 10. = _ 11. = _ Problem Solving 1. nnette is making a fruit drink that calls for _ cup of fresh lemon juice. She has cup of lemon juice. How much more lemon juice does nnette need? 1. Ramon needs to walk _ mile to the bus stop. He has walked _ mile so far. How much farther does Ramon need to walk to get to the bus stop? Module Lesson 0

6 Lesson heck TEXS Test Prep Fill in the bubble completely to show your answer. 1. Matt spent of the money in his pocket on a movie ticket. He spent of the money on a snack. What fraction of his money is left? Jabar used fraction strips to model the difference of 1. Which represents the difference? seven 1 1 strips one 1 1 strip two 1 1 strips five 1 1 strips 1. Which fraction correctly completes the equation? _ = 17. Three friends share a pizza divided into eighths. If each person eats one slice, how many more slices must be eaten so that of the pizza remains? 1 1. Multi-Step Sara and Jon each ordered a medium pizza. Sara ate _ of her pizza for lunch and for a snack. Jon ate of his pizza for lunch and for a snack. How much more pizza did Jon eat? Multi-Step On field day, 10 1 of the students in Mrs. rown s class competed in jumping events, _ of the students competed in running events, and 10 1 competed in throwing events. What part of Mrs. rown s class did not compete in jumping, running, or throwing events? 7 10