Subtracting Fractions with LIKE Denominators

SUBTRACTING FRACTIONS WITH LIKE DENOMINATORS

Whenever you subtract fractions with like denominators, you subtract the numerators to create the answer numerator, use the same denominators as the answer denominator. In other words, do not change the denominator for your answer.

DON'T FORGET TO CHANGE YOUR ANSWER IN LOWEST TERM!

Here are some few examples to help you.

5/6 - 1/6 = 4/6 or 2 /3Show with picture or model.

3/4 - 1/4 = 2/4 or 1/2

1/3 - 1/3 = 0/3 or 0

7/10 - 3/10 = 4/10 or 2/5

1 - 1/9 = 8/9

To subtract a whole number to a fraction, we already know that the denominator has to be the same. In this case, the fraction's denominator in the left side is 9. We also know that any number that have the same numerator and denominator is equal to one. So the fraction will look like this:





9/9 - 1/9 = 8/9. (SIMPLE)


http://www.youtube.com/watch?v=0pl_up6knbI

http://www.youtube.com/watch?v=9L8NTb5-5-I

http://www.youtube.com/watch?v=LlxIzuIYcRs

DO PAGE 220 - 221 #1 - 14 odd then even.

subtracting

ADDING FRACTIONS

Adding Fractions

there is many ways to solve fraction problems.


-one way is to show them is by drawing pictures.

For Example:



-another way is to use a diagram




For example:

once you watched that video try this and answer in lowest terms:



lowest terms mean the lowest equivalent fraction for the answer of a problem.






you could also practice on these sites:

action fraction

worksheet

extra practice games

the rule for when adding fractions with like denominators(same bottom number)add only the numerator.




-DO NOT ADD THE DENOMINATOR. it has to stay the same.

DIVISIBILITY

DIVISIBILITY :)

-when a number can be divided by another number without remainder.





DIVISIBILITY RULES

-quick ways to determine if a number is divisible by another number.





RULE FOR 2

-all even numbers are divisible by 2

- any number that ends with 0,2,4,6,8

eg:4 is divisible by 2

280 is divisible by 2

2971 is not divisible by 2



RULE FOR 5

-any number that ends with 0 and 5

eg: 155 is divisible by 5

8974 is not divisible by 5



RULE FOR 10

-any number that ends with 0

eg: 1070 is divisible by 10

27367 is not divisible by 10

360.4 is not divisible by 10

364.0 is not divisible by 10



RULE FOR 4

- look at the last two digits are they divisible by 2 twice?

- the rule for 4 is if the last2 digits are divisible by 2 twice the number is divisible by 4

eg: 42 4/2=2 2/2=1 42 is divisible by 4

10 10/2=5 5/2=2.5 10 is not divisible by 4



RULE FOR 8

- if the last 2 digits are divisible by 2 three times, the number is divisible by8

eg: 16 16/2=8 8/2=4 4/2=2 16 is divisible by 8

18 18/2=9 9/2=4.5 18 is not divisible by 8



RULE FOR 3

- add up all the digits until you have a single digit. If that digit is 3 the number is divisible by 3.

eg:93 9+3=12 1+2=3 93 is divisible by 3

1045 1+0+4+5=10 1+0=1 1045 is not divisible by 3

RULE FOR 6

-any number that is divisible by 2 and 3

RULE FOR 9

-add up all the digits until you have a single digit. If that digit is 9 the number is divisible by 9.

eg: 54 5+4=9 54 is divisible by 9

468 4+6+8=18 1+8=9 468 is divisible by 9

2345 2+3+4+5=14 1+4=5 2345 is not divisible by 9

RULE FOR 7

-use calculator! THERE IS NO SHORTCUT YET! Find one then name it after your self! :)

QUOTIENT

-is the result of division question.

eg: 12/2=6, 6 is the quotient.

HERE ARE SOME LINKS THAT CAN HELP YOU UNDERSTAND DIVISIBILITY EVEN MORE:)

http://www.youtube.com/watch?v=UZYpOKtylxM

http://www.mathgoodies.com/lessons/vol3/divisibility.html

1. Pg 190-193

2. Pg 168-170

3. Pg 180-182

4. Pg 162-164

5. Pg 174-176

6. fraction, Decimal, Percent, Words, and Pictures.


7. Trudy, Shana, Saira, Kendra, and Tracie are on team A. Jordan, Micheal, Terrance, Sean, and Suni are on team B. Use a tree diagram to show all possible outcomes if the coach assigns each person a team B to defend against a player on team A. Write the sample space.

8. A toonie is flipped and a 4 sided die is rolled using a chart find P(tails and an odd number).

9. Create and answer a probability question with the results of 0%, 20%, 60%, and 100%.

10. A jar contains 4 pink, 26 purple, and 9 orange marbles. The marbles are drawn at random. What are the chances you get 2 pink marbles in a row without replacing the first marble.?

11. All corrections from the probability unit test.