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Decimals & Fractions

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by

Grace Delgado

on 2 May 2011

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Transcript of Decimals & Fractions

Decimals & Fractions This is a decimal. . It tells what portion of a number somethinig is. This is an example of a decimal, 0.5 This is a fraction
1/2 It also tells how much something is compared to a whole Both of the samples symbolize one half of a number
1/2 = 0.5 Adding fractions & decimals Ex:
1/2 + 2/2= 3/2 = 1/2 1 The first step is to add the numerator 1/2 + 2\2 =
1/_ + 2/_ = 3/_ Next you keep the denominator if they are the same. _/2 + _/2 = _/2 Finally, you convert it to a mixed number if the numerator is bigger then the denominator. 1/2 + 2/2 = 3/2 = 1/2 Subtracting fractions and decimals
Ex:
0.5 + 0. 25 = 0. 75 First, line up the decimals in both numbers.
0.5
+0.25 __ Then, drop the decimal to the answer and add. 0.5
+0.25 __ . 0 0.50 is the same as 0.5 0 75 Adding decimals and fractions are easy! Lets start with fractions first. Now lets go on to decimals. Its just about the same rules as adding fractions and decimals. Subtracting decimals and fractions are easy. Lets start with fractions. It is just like adding fractions.
3/4
-4/4 __ 7/4 5/6
-2/6 Subtracting decimals is simple and quick. It's
just like adding decimals, but this time you're
subtracting. 0.34
- 0.20
__ 0.14 Multiplying Fractions and decimals Multiplying fractions is simple and fast.
First, you have to multiply the numerators 3 6 x _ _ 4 7 = 2 3 You can cross reduce 4 and 6 by dividing each number by 2 Then, you multiply the denominators 3 3
_ _ 2 7 x = 14 9 _ 9 _ Reduce if nessisary Multiplying decimals is as easy as 123! First of all dont worry about lining up the decimals.

Multiply like you would regularly multiply a number

After you finish multiplying, see how many decimal spots you skip over in each number. Then skip the same number of places in the product 12.67
x 30.2 _____ 2534
+ 380100 _______ 382634 . Now lets see how to add and subtract fractions and decimals Just subtract the numerators and keep the denominators.
It's that simple to add and subtract fractions! __ 3/6 = 1/2 Remember to reduce if nessisary! Now lets move on to decimals! See how simple that is! Now you know how to add and subtract. Now let's move on to something a little harder. Dividing fractions and decimals Now this could get to be a little harder than adding, subtracting, and multiplying decimals. First, you have to remember these 3 steps To divide decimals read these steps then look at the example Keep
Change
Flip 1 5
4 6 _ _ _ .
. 1
4 _ - = x .
. 1 6
4 5 _ _ x Then just multiply the numbers to get your answer! First, look at the decimal you have for the divisor. If it has a decimal, hop it over all the way to the right then the same number of hops you used for the divisor, do the same with the dividend

Then, float your decimal up to the quotient.

Finally, divide just like you normally would with a regular number .78 - .5 = .78/ 0.5 __ .
. 78./ 050.0 ___ .
78/ 050.0 ____ I hope you learned how to add, subtract, multiply, and divide fractions and decimals! Prezi by: Grace Delgado
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