MULTIPLYING FRACTIONS By Mrs Muller Key Vocabulary The

MULTIPLYING FRACTIONS By, Mrs. Muller

Key Vocabulary The numerator: The top number of the fraction (the part of the whole) The denominator: The bottom number of the fraction (the whole) Multiply: obtain from (a number) another that contains the first number a specified number of times.

Example of Multiplication 2 x 7 Means that there are two groups of 7 Group 1 Group 2 The answer is 14 Another way to say it is adding the 7 together the amount of the groups: 7+7=14 So 3 x 7 would be 7+7+7=21, and 5 x 7=7+7+7=35; memorizing is just quicker.

Let’s take this to fractions 2 x = Let’s look at what this would look like with fraction strips: How many 1/3 tiles will you need? Group 2 Group 1 That would mean that it would be 1/3+1/3, which would equal 2/3. Meaning that 2 x 1/3=2/3

One more Example 4 x = Let’s look at what this would look like with fraction strips: How many 1/5 tiles will you need? Group 1 Group 2 Group 3 Group 4 That would mean that it would be 1/5+1/5+1/5, which would equal 4/5 Meaning that 4 x 1/5=4/5 What do you notice about multiplying fractions? What do you notice about the numerator and denominator?

The Procedure Multiply the numerators together Multiply the denominators together Example: x

Let’s Practice