**Subtracting Fractions**

**With like denominators:**

5/6 -1/6= 4/6= 2/3

Show with a picture or model:

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

Solve:

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

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

*Homework*

Do pages 220- 221. #1- 14 odd then even

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## Friday, February 26, 2010

###
Subtracting Fractions

## Thursday, February 18, 2010

###
Adding Fractions

## Monday, February 8, 2010

###
Divisibility

**Divisible:**

- When a number can be divided by another number, with no remainders.

**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 ending in 0, 2, 4, 6, 8.

**Rule for 3:**

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

e.g 93 9 + 3 = 12

1 + 2 = 3 yes

273 2 + 7 + 3 = 12

1 + 2 = 3 yes

1045 = 1 + 0 + 4 + 5 = 10

1 + 0 = 1 no

**Rule for 4:**

- If the last 2 digits are divisible by 2 twice, then the number is divisible by 4.

e.g 4 divided by 2 = 2 2 divided by 2 = 1 yes

16 divided by 2 = 8 8 divided by 2 = 4 yes

10 divided by 2 = 5 5 divided by 2 = 2.5 no

- 2 x 4 = 8

2 x 2 x 2 = 8

- The rule for 4 is if the last 2 digits are divisible by 2 twice, then the number is divisible by 4.

**Rule for 5:**

- Any number that ends in 5 or 0 is divisible by 5.

e.g 155 is divisible by 5

8974 is not divisible by 5

**Rule for 6:**

- Any number that is divisible by 2 and 3 is divisible by 6.

**Rule for 7:**

- Use a calculator.

- There is no short cut for 7. Yet.

- You should find one, and name it after yourself.

**Rule for 8:**

- If the last 2 digits are divisible by 2 three times, then the number is also divisible by 8.

e.g 16 divided by 2 = 8. 8 divided by 2 = 4. 4 divided by 2 = 2 yes

18 divided by 2 = 9. 9 divided by 2 = 4.5 no

17948 48 divided by 2 = 24. 24 divided by 2 = 12. 12 divided by 2 = 6 yes

**Rule for 9:**

- Add up all the digits until you have 1 digit left. If that digit is 9 the number is divisible by 9.

e.g 18 1 + 8 = 9 yes

54 5 + 4 = 9 yes

468 4 + 6 + 8 = 18 yes

1 + 8 = 9

2345 2 + 3 + 4 + 5 = 14

1 + 4 = 5 no

**Rule for 10:**

- Any number that ends in 0 is divisible by 10.

e.g 1070 is divisible by 10

27367 is not divisible by 10

3604 is not divisible by 10

**Rule for 0:**

- Nothing is divisible by zero.

**Quotient:**

- The result of a division question.

e.g 12 divided by 2 = 6, the quotient is 6.

http://www.basic-mathematics.com/divisibility-rules-game.html

This is a link that has a divisibility game on it to test your divisibility knowledge.

If you are also having any trouble with other basic math stuff, there are also other games and problems to help you out.

Try to figure out the answers to these division questions to get better at division and divisibility.

REMEMBER TO WEAR BLACK TOMORROW FOR THE GYM RIOT!!

If there is any mistakes or questions, please feel free to ask or tell me.

## Tuesday, February 2, 2010

###
Experimental & Theoretical Probability

## Helpful Math Sites

- When a number can be divided by another number, with no remainders.

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

- All even numbers are divisible by 2.

- Any number ending in 0, 2, 4, 6, 8.

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

e.g 93 9 + 3 = 12

1 + 2 = 3 yes

273 2 + 7 + 3 = 12

1 + 2 = 3 yes

1045 = 1 + 0 + 4 + 5 = 10

1 + 0 = 1 no

- If the last 2 digits are divisible by 2 twice, then the number is divisible by 4.

e.g 4 divided by 2 = 2 2 divided by 2 = 1 yes

16 divided by 2 = 8 8 divided by 2 = 4 yes

10 divided by 2 = 5 5 divided by 2 = 2.5 no

- 2 x 4 = 8

2 x 2 x 2 = 8

- The rule for 4 is if the last 2 digits are divisible by 2 twice, then the number is divisible by 4.

- Any number that ends in 5 or 0 is divisible by 5.

e.g 155 is divisible by 5

8974 is not divisible by 5

- Any number that is divisible by 2 and 3 is divisible by 6.

- Use a calculator.

- There is no short cut for 7. Yet.

- You should find one, and name it after yourself.

- If the last 2 digits are divisible by 2 three times, then the number is also divisible by 8.

e.g 16 divided by 2 = 8. 8 divided by 2 = 4. 4 divided by 2 = 2 yes

18 divided by 2 = 9. 9 divided by 2 = 4.5 no

17948 48 divided by 2 = 24. 24 divided by 2 = 12. 12 divided by 2 = 6 yes

- Add up all the digits until you have 1 digit left. If that digit is 9 the number is divisible by 9.

e.g 18 1 + 8 = 9 yes

54 5 + 4 = 9 yes

468 4 + 6 + 8 = 18 yes

1 + 8 = 9

2345 2 + 3 + 4 + 5 = 14

1 + 4 = 5 no

- Any number that ends in 0 is divisible by 10.

e.g 1070 is divisible by 10

27367 is not divisible by 10

3604 is not divisible by 10

- Nothing is divisible by zero.

- The result of a division question.

e.g 12 divided by 2 = 6, the quotient is 6.

http://www.basic-mathematics.com/divisibility-rules-game.html

This is a link that has a divisibility game on it to test your divisibility knowledge.

If you are also having any trouble with other basic math stuff, there are also other games and problems to help you out.

Try to figure out the answers to these division questions to get better at division and divisibility.

REMEMBER TO WEAR BLACK TOMORROW FOR THE GYM RIOT!!

If there is any mistakes or questions, please feel free to ask or tell me.

"Probability"

Flip 2 pennies 10 times

Find theoretical probabily of each possibility.

Experimental and Theoretical Probability

Here is a video you guys should watch to help you

to understand what we are doing in school . (:

---**HOMEWORK** ---

pages 186 - 189

numbers 1-13

Flip 2 pennies 10 times

Find theoretical probabily of each possibility.

Experimental and Theoretical Probability

Here is a video you guys should watch to help you

to understand what we are doing in school . (:

---

pages 186 - 189

numbers 1-13

-- Feel free to ask questions (:

Labels:
experimental,
homework,
outcomes,
theoretical

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