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CCSS 4 th Grade Numbers and Operations – Fractions 3.0a.2 Understand addition and subtraction of fractions as joining and separating parts referring to.

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Presentation on theme: "CCSS 4 th Grade Numbers and Operations – Fractions 3.0a.2 Understand addition and subtraction of fractions as joining and separating parts referring to."— Presentation transcript:

1 CCSS 4 th Grade Numbers and Operations – Fractions 3.0a.2 Understand addition and subtraction of fractions as joining and separating parts referring to the same whole. Lesson to be used by EDI-trained teachers only. READY TO TEACH SM EDI ® Lessons ©2013 All rights reserved. We will subtract fractions with like denominators. What are we going to do? CFU 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 Name Learning Objective Activate Prior Knowledge 2 3 numerator denominator Fraction Find the equivalent fractions below  2   3  Equivalent fractions are fractions that have the same value.

2 CCSS 4 th Grade Numbers and Operations – Fractions 3.0a.2 Subtract fractions with like denominators. Lesson to be used by EDI-trained teachers only. ©2013 All rights reserved. Which subtraction problem has fractions with like denominators? How do you know? A B CFU 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. Subtracting Fractions Adolfo has eight-twelfths of a pie. If he eats two-twelfths of the pie how much of the pie is left?  8  28  2    2 3 numerator denominator Fraction

3 CCSS 4 th Grade Numbers and Operations – Fractions 3.0a.2 Subtract fractions with like denominators. Lesson to be used by EDI-trained teachers only. ©2013 All rights reserved. How did I/you subtract the fractions? How did I/you reduce the difference? CFU 2 1b 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 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  1 5  3 6  2 6   2 8  8 8  3 8 

4 CCSS 4 th Grade Numbers and Operations – Fractions 3.0a.2 Subtract fractions with like denominators. Lesson to be used by EDI-trained teachers only. ©2013 All rights reserved. Skill Development/Guided Practice (continued) How did I/you subtract the fractions? How did I/you reduce the difference? CFU 2 1b 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 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  3 8  9 10  3   1 4   3 6 

5 CCSS 4 th Grade Numbers and Operations – Fractions 3.0a.2 Subtract fractions with like denominators. Lesson to be used by EDI-trained teachers only. ©2013 All rights reserved. Skill Development/Guided Practice (continued) How did I/you subtract the fractions? How did I/you reduce the difference? CFU 2 1b 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 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  1  6  2   3 8   4 

6 CCSS 4 th Grade Numbers and Operations – Fractions 3.0a.2 Subtract fractions with like denominators. Lesson to be used by EDI-trained teachers only. ©2013 All rights reserved. Skill Development/Guided Practice (continued) 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 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?

7 CCSS 4 th Grade Numbers and Operations – Fractions 3.0a.2 Subtract fractions with like denominators. Lesson to be used by EDI-trained teachers only. ©2013 All rights reserved. Subtracting fractions with like denominators will help you while cooking. Subtracting fractions with like denominators will help you do well on tests. 1 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 2 Relevance To subtract fractions, both fractions must have a like denominator. The difference of fractions must be reduced to the lowest terms. 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. Sample Test Question: 42. Which of the following equations correctly subtracts the fractions? Yes No

8 CCSS 4 th Grade Numbers and Operations – Fractions 3.0a.2 Subtract fractions with like denominators. Lesson to be used by EDI-trained teachers only. ©2013 All rights reserved. Abel has subtracted the fractions below. Mrs. Lee says that the answer is incorrect. Explain the mistake that Abel made. _____________________________________ _____________________________________ _____________________________________ What did you learn today about subtracting fractions with like denominators? (Pair-Share) Use words from the word bank. Day 1 ____________________________________________________________ _________________________________________________________________ Day 2 ____________________________________________________________ _________________________________________________________________ Access Common Core Summary Closure To subtract fractions, both fractions must have a like denominator. The difference of fractions must be reduced to the lowest terms. 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 2 3 numerator denominator Fraction Skill Closure  1   1  Word Bank fraction numerator denominator reduce 7 10  2 

9 CCSS 4 th Grade Numbers and Operations – Fractions 3.0a.2 Subtract fractions with like denominators. Lesson to be used by EDI-trained teachers only. ©2013 All rights reserved. Name Independent Practice 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 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  1 6   5 8   3   2   3   3 8   1 8   4 

10 CCSS 4 th Grade Numbers and Operations – Fractions 3.0a.2 Subtract fractions with like denominators. Lesson to be used by EDI-trained teachers only. ©2013 All rights reserved. Name Periodic Review 1 Access Common Core  3   2 8  Which of the following fractions are correctly subtracted and reduced? YesNo 6 12  3 3    6   5  

11 CCSS 4 th Grade Numbers and Operations – Fractions 3.0a.2 Subtract fractions with like denominators. Lesson to be used by EDI-trained teachers only. ©2013 All rights reserved. Name Periodic Review 2 Access Common Core  3   5  Bradley subtracted the fractions below. Some of his answers are incorrect. Circle all the incorrect answers and write the correct solutions. 3 8  3 8  2 10  1  3 6  1 6  2 4  1 4  5 12  4  6 10  2  3 6  3 6  5  3  3 4  1 4  9  4  3 8  1 8  6 8  1 8 

12 CCSS 4 th Grade Numbers and Operations – Fractions 3.0a.2 Subtract fractions with like denominators. Lesson to be used by EDI-trained teachers only. ©2013 All rights reserved. Name Periodic Review 3 Access Common Core  4   1  YesNo Choose Yes or No to show whether each choice represents the difference of 


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