Add, Subtract and Multiply Fractions

Remember that you need to find a common denominator. Whatever you multiply the denominator by to get a common denominaot, you also mutliply the bumerator byh the same number

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Adding and Subtracting Fractions

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Multiple Choice

1) What is the sum of these fractions in lowest terms? Don't forget that you need a common denominator.

• 4/5
• 3/20
• 17/20
• 4/20

Multiple Choice

2) What is the sum? Make sure you get common denominators first.

• $$\frac{6}{12}$$

• $$\frac{17}{12}$$

• 1

• $$\frac{5}{7}$$

Multiple Choice

3) What is the difference? You need a common denominator.

• $$\frac{13}{24}$$

• $$\frac{5}{24}$$

• $$\frac{12}{48}$$

• $$\frac{6}{5}$$

Multiple Choice

$$\frac{2}{5}-\frac{1}{4}$$   4) Don't forget a common denominator

• 1

• $$\frac{2}{20}$$  

• $$\frac{3}{20}$$  

• $$\frac{3}{4}$$  

Change mixed numbers into improper fractions and cross cancel if you can.

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Multiplying Fractions

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Multiple Choice

$$\frac{1}{3\ }\times\ \frac{3}{5\ }=$$   5) Multiply straight across and then SIMPLIFY

• $$\frac{1}{5}$$  

• $$\frac{3}{15}$$  

• $$\frac{1}{6}$$  

Multiple Choice

$$\frac{4}{5}\times\frac{1}{4}=$$   6) Cross cancel first

• $$\frac{1}{3}$$  

• $$\frac{1}{5}$$  

• $$\frac{4}{20}$$  

Multiple Choice

3/7 x 21/24 - 7) You can double cross cancel first

• 3/8

• 63/24

• 21/56

• 9/24

Multiple Choice

$$\frac{1}{5}\times2\frac{1}{4}$$   8) Change mixed numbers to improper first

• $$\frac{9}{20}$$  

• $$\frac{9}{15}$$  

• $$\frac{3}{15}$$  

• $$\frac{5}{20}$$  

Multiple Choice

$$\frac{1}{8}\times1\frac{1}{5}$$   9) Change mixed number to improper and cross cancel if you can

• $$\frac{2}{17}$$  

• $$\frac{3}{17}$$  

• $$\frac{2}{20}$$  

• $$\frac{3}{20}$$  

Poll

After spending a week on fractions, I am still unclear about... (choose all that apply)

• Adding Fractions

• Subtracting Fractions

• Multiplying Fractions

• I think I am good for now