Adding and Subtracting Fraction w/Like and Unlike Denominator

​Adding and Subtracting Fractions w/Like and Unlike Denominator

​Ms. Sy's 5th Grade

​Standards

• 5.NF.1 Add and subtract fractions with unlike denominators (including mixed numbers) by replacing given fractions with equivalent fractions in such a way as to produce an equivalent sum or difference of fractions with like denominators. For example, 2/3 + 5/4 = 8/12 + 15/12 = 23/12. (In general, a/b + c/d = (ad + bc)/bd.)

• 5.NF.2  Solve word problems involving addition and subtraction of fractions referring to the same whole, including cases of unlike denominators, e.g., by using visual fraction models or equations to represent the problem. Use benchmark fractions and number sense of fractions to estimate mentally and assess the reasonableness of answers. For example, recognize an incorrect result 2/5 + 1/2 = 3/7, by observing that 3/7 < 1/2.

5th Grade | Mathematics

​Objectives

• Students will be able to solve two-step word problems.

• ​Students will be able to add and subtract like and unlike denominators.

Sth Grade | Mathematics

Multiple Choice

• $$\frac{20}{24}$$  

• $$\frac{\text{19}}{\text{24}}$$  

• $$1\frac{\text{19}}{\text{24}}$$  

• $$1\frac{\text{20}}{\text{24}}$$  

Multiple Choice

• 3/8

• $$\frac{\text{11}}{\text{15}}$$  

• 3/15

Multiple Choice

• 13/20

• 3/9

• 8/10

• 20/30

Multiple Choice

• 1/14

• 1/4

Multiple Choice

• 5/12

• 3/6

• 1/3

• 1/9

Open Ended

What is 5/6 - 2/3 =

Multiple Choice

• 3/1

• 10/12

• 7/11

• 13/30

Multiple Choice

Does 1/4 + 1/5 = 9/20

• Yes

• No, it equals 2/9

• No, it equals 3/9

Open Ended

What have you learned about adding and subtracting decimals with unlike denominator? What questions do you still have about this concept?