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Fractions and Decimals

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Danielle Lourenco

on 7 January 2014

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Transcript of Fractions and Decimals

Equivalent Fractions
Equilvalent Fractions are fractions

So, if you ate 1/2 of the pizza, or 4/8 slices of a pizza, you ate the

. 1/2 and 4/8 are equivalent.

To calculate Equivalent Fractions, just mulitiply the numerator and denominator by the same #!!! (you choose the #)
Try This...
Find Equivalent Fractions for the following:

a) 2/3 b) 4/7

Simplest Form:
A fraction is in
simplest form
when the numerator and denominator have no common factors.
Adding Fractions
With Like Denominators
When denominators are the same, adding fractions is Easy Peezie, Lemon Squeezie.
Now it's your turn:
a) 2/7 + 3/7 =
is part of a whole.

For example, if you ate 3 slices of a pizza, you ate a fraction (or part) of the whole pizza.
You ate 3/8 (Three Eigths, or 3 out of 8 slices)

In the fraction 3/8, the 3 is called the
(top #) and the 8 is called the
(bottom #)

a) 2/3 = 4/6
Hint: Multiply the top and bottom #
by the same #
For 2/3, I multiplied both the 2 and the 3 by 2 to get 4/6
b) 4/7 = 40/70
For 4/7, I multiplied both the 4 and the 7 by 10 to get 40/70
Does it matter what # I
multiply the fraction by
when finding equivalent
Just add the numerators, and leave
the denominator alone.
For example, 1/5 + 3/5 = 4/5
7/12 + 1/12 = 8/12
{which can be reduced}
{simplest form}
I know you're very excited
to try this out...
b) 3/10 + 6/10 =
c) 4/15 + 6/15 =
= 5/7
= 9/10
which can be reduced to simplest form by dividing top and bottom # by 5. Sooooooooo,
10/15 in simplest form is 2/3
with Like Denominators
This follows the same rules, but instead of adding the numerators, you subtract them.
a) 7/9 - 2/9 = 5/9
b) 10/15 - 3/15 = 7/15
Adding Fractions with Unlike Denominators
This is a neat trick
Full transcript