SGS_M_Adding and Subtracting Dissimilar Fractions

When can we add or subtract fractions?

• We can add or subtract fractions if and only if their denominators are the same.

• We can only add or subtract fractions if and only if their numerators are the same.

• We can add or subtract fractions if and only if they are dissimilar.

• We can add or subtract fractions simply by adding or subtracting their numerators as well as adding or subtracting their denominators.

Tags

CCSS.4.NF.B.3C

CCSS.4.NF.B.3D

In the case that the given fractions are dissimilar, how shall we make them similar being the only way to proceed to addition or subtraction of fractions?

• Add the denominators together. Whatever is the sum, that will be the denominator for both fractions.

• Just choose either of the denominator from both fractions that you wanted as new denominator before you proceed to adding and subtracting the numerators.

• Simply find LCD and use such LCD as the new denominator for both fractions. Then find equivalent fractions for each given.

• All of the above.

Tags

CCSS.5.NF.A.1

CCSS.5.NF.A.2

What is the LCD of the given fraction: 11/12 and 7/8?

• 16

• 36

• 21

• 24

• 1 4/15

• 2 5/15

• 1 5/15

• 2 4/15

Tags

CCSS.7.NS.A.1C

In adding or subtracting similar fractions, what should you do in their denominators?

• Add or subtract

• Copy

• Find their LCD

• None of these

Tags

CCSS.4.NF.B.3C

CCSS.4.NF.B.3D

What is the last step in adding or subtracting fractions?

• Find their LCD

• Add or subtract the whole number

• Copy the denominator

• Simplify

Tags

CCSS.5.NF.A.1

CCSS.5.NF.A.2

2  2/10 + 5  1/5 =
Simplify/Reduce if needed.

• 5  3/4
• 7  2/5
• 3  3/5
• 7  4/10

Tags

CCSS.5.NF.A.1

CCSS.5.NF.A.2

What is $\frac{12}{36}+\frac{9}{36}=$   ?

•  $\frac{27}{28}$  

•  $\frac{21}{36}$  

•  $\frac{20}{37}$  

Tags

CCSS.4.NF.B.3C

CCSS.4.NF.B.3D

How do we subtract similar fractions?

• subtract the numerators then subtract the common denominator

• subtract the numerators then copy the common denominator

• subtract the common denominator then copy the numerators

• None of the above

Tags

CCSS.4.NF.B.3C

CCSS.4.NF.B.3D

• 1/20
• 2/20
• 4/20
• 11/20

Tags

CCSS.5.NF.B.6