# Name Learning Objective

## Presentation on theme: "Name Learning Objective"— Presentation transcript:

Name Learning Objective We will subtract fractions with like denominators. What are we going to do? CFU Activate Prior Knowledge Equivalent fractions are fractions that have the same value. Find the equivalent fractions below. 2 3 numerator denominator Fraction 1. 6 12 = 2 2. 4 12 = 3 Students, you already know how to reduce fractions to the lowest terms. Now, we will use reducing fractions when subtracting fractions with like denominators. Make Connection

Concept Development Fractions with like denominators have the same number of equal parts. To subtract fractions, both fractions must have a like denominator. The difference of fractions must be reduced to the lowest terms. 2 3 numerator denominator Fraction Subtracting Fractions Adolfo has eight-twelfths of a pie. If he eats two-twelfths of the pie how much of the pie is left? - = 12 8 12 2 8 - 2 12 12 6 - = = Which subtraction problem has fractions with like denominators? How do you know? A B CFU 6 12 2 - 4 12 6 -

Skill Development/Guided Practice
To subtract fractions, both fractions must have a like denominator. The difference of fractions must be reduced to the lowest terms. 2 3 numerator denominator Fraction Subtract fractions with like denominators. 1 Subtract the fractions. (write) Keep the same denominator. Subtract the numerators. Reduce the difference, if needed. Read the difference out loud. “___ minus ___ equals ___.” a 2 3 b 1. 2. 2 5 - 1 = 3 6 4. 3. 5 8 - 2 = 3 How did I/you subtract the fractions? How did I/you reduce the difference? CFU 2 1b

Skill Development/Guided Practice (continued)
To subtract fractions, both fractions must have a like denominator. The difference of fractions must be reduced to the lowest terms. 2 3 numerator denominator Fraction Subtract fractions with like denominators. 1 Subtract the fractions. (write) Keep the same denominator. Subtract the numerators. Reduce the difference, if needed. Read the difference out loud. “___ minus ___ equals ___.” a 2 3 b 5. 3 4 - 1 = 6. 5 6 7. 8. 7 8 - 3 = 9 10 How did I/you subtract the fractions? How did I/you reduce the difference? CFU 2 1b

Skill Development/Guided Practice (continued)
To subtract fractions, both fractions must have a like denominator. The difference of fractions must be reduced to the lowest terms. 2 3 numerator denominator Fraction Subtract fractions with like denominators. 1 Subtract the fractions. (write) Keep the same denominator. Subtract the numerators. Reduce the difference, if needed. Read the difference out loud. “___ minus ___ equals ___.” a 2 3 b 10. 9. 10 12 - 1 = 6 2 11. 5 8 - 3 = 12. 6 10 4 How did I/you subtract the fractions? How did I/you reduce the difference? CFU 2 1b

Skill Development/Guided Practice (continued)
Liu has a piece of ribbon that is of an inch long. She cuts the ribbon into two pieces. One piece is of an inch long. How long is the other piece of ribbon? Angela has of a pie. Her family eats of the pie. How much of the pie is left? How did I/you determine what the question is asking? How did I/you determine the math concept required? How did I/you determine the relevant information? How did I/you solve and interpret the problem? How did I/you check the reasonableness of the answer? CFU 4 1 3 2 5

Relevance To subtract fractions, both fractions must have a like denominator. The difference of fractions must be reduced to the lowest terms. 1 Subtracting fractions with like denominators will help you while cooking. Abdul is baking a batch of muffins. He has ¾ of a cup of blueberries. The recipe calls for ¼ cup of blueberries. He will have ½ cup of blueberries left. 2 Subtracting fractions with like denominators will help you do well on tests. Sample Test Question: 42. Which of the following equations correctly subtracts the fractions? Yes No Does anyone else have another reason why it is relevant to subtract fractions with like denominators? (Pair-Share) Why is it relevant to subtract fractions with like denominators? You may give one of my reasons or one of your own. Which reason is more relevant to you? Why? CFU

To subtract fractions, both fractions must have a like denominator.
The difference of fractions must be reduced to the lowest terms. Skill Closure Subtract fractions with like denominators. 1 Subtract the fractions. (write) Keep the same denominator. Subtract the numerators. Reduce the difference, if needed. Read the difference out loud. “___ minus ___ equals ___.” a 2 3 b numerator denominator Fraction 1. 8 10 - 1 = 2. 5 12 - 1 = Access Common Core Abel has subtracted the fractions below. Mrs. Lee says that the answer is incorrect. Explain the mistake that Abel made. 7 10 - 2 = Word Bank fraction numerator denominator reduce _____________________________________ _____________________________________ _____________________________________ Summary Closure What did you learn today about subtracting fractions with like denominators? (Pair-Share) Use words from the word bank. Day 1 ____________________________________________________________ _________________________________________________________________ Day 2 ____________________________________________________________

Name Independent Practice To subtract fractions, both fractions must have a like denominator. The difference of fractions must be reduced to the lowest terms. 2 3 numerator denominator Fraction Subtract fractions with like denominators. 1 Subtract the fractions. (write) Keep the same denominator. Subtract the numerators. Reduce the difference, if needed. Read the difference out loud. “___ minus ___ equals ___.” a 2 3 b 1. 3 6 - 1 = 2. 7 8 5 3. 7 10 - 3 = 4. 4 2 5. 6 12 - 3 = 6. 4 8 7. 5 8 - 1 = 8. 12 4

Name Periodic Review 1 1. 5 10 - 3 = 2. 4 8 - 2 = Access Common Core Which of the following fractions are correctly subtracted and reduced? 6 12 - 3 = Yes No 11 12 - 6 5 = Yes No 6 12 - 3 4 = Yes No 5 12 - 3 1 6 = Yes No

Name Periodic Review 2 1. 4 12 - 3 = 2. 5 12 - = Access Common Core Bradley subtracted the fractions below. Some of his answers are incorrect. Circle all the incorrect answers and write the correct solutions. 3 8 - = 2 10 1 6 4 5 12 - 4 = 6 10 2 3 3 4 - 1 = 9 10 8 6

Name Periodic Review 3 1. 4 12 - = 2. 5 12 - 1 = Access Common Core Choose Yes or No to show whether each choice represents the difference of 10 12 4 - Yes No 3 6