Understanding Multiplication by a Fraction

Multiplying Fractions

When multiplying Fractions

• you first multiply the numerators

• secondly you multiply the denominators

• Reduce the fractions (if possible)

Poll

What are the numerators in this problem?

• 2 and 3

• 5 and 4

Fill in the Blanks

2 times 3 is

.

Multiple Choice

The denominators are

• 2 and 3

• 5 and 4

Fill in the Blanks

5 times 4 equals

After multiplying straight across we find a product of 6/20 which can be reduced.

Reducing Fractions

• when reducing fractions you must find a number the can evenly go into both numbers

Multiple Choice

What number can evenly go into 6 and 20

• 3

• 4

• 5

• 2

After dividing 6 (numerator) and 20 (denominator) both by 2

• the new numerator is 3

• the new denominator is 10

• 3/10 is our final answer

Multiplying Fractions Practice

If you have paper and a writing utensil you may find it useful at this time.

Multiple Choice

Find the answer in simplest form:

3/7 x 2/3

• 18/21

• 9/10

• 6

• 6/21

Multiple Choice

What is 2/3 x 2/3 

• 4/9
• 2/3
• 4/3
• 4/6

Multiple Choice

Multiply these fractions:

• 1/5
• 1 / 1
• 1 / 6
• 0

Multiple Choice

Find the product:

• 2/14
• 1/49
• 2/7
• 1/14

Multiple Choice

1/2 x 3/4 (simplify if needed)

• 3/8

• 3/4

• 4/6

• 3/2

Multiple Choice

³⁄₅ × ²⁄₅ =

• ⁵⁄₁₀

• ⁶⁄₅

• ⁶⁄₂₅

• ¹⁄₅

Multiple Choice

Multiply 2/6 x 3/5

• 1/5

• 3 / 11

• 6/30

• 14/15

multiplying fractions and whole numbers

When multiplying fraction and a whole number

• you first put the whole number over 1

• after you put the whole number over one you multiply straight across

• numerator times numerator

• Denominator times denominator

• reduce if necessary

Improper Fractions

Occur when the numerator is greater than the denominator.

Turning improper fractions into mixed number

• divide the numerator by the denominator

• the denominator stays the same

• the remainder becomes the new numerator

• the quotient becomes the whole number

• 15/4 is 3 3/4

Multiple Choice

Find the product. Then, simplify.

• 20

• 2/90

• 10

• 60/3

Multiple Choice

Find the product:

• 3/50
• 30/5
• 6
• 1  1/5

Multiple Select

Do you understand multiplying fractions?

• YES - I GOT THIS!

• NO - Please HELP!