Integers

Negative numbers represent values below zero and positive numbers represent values above zero.

eg. above and below ground or sea level

1 + (-2) = (-1) is an addition statement

3 - (-1) = 4 is a subtraction statement

Milton Family's Budget

Food 33%                      If they have $500, how much do they spend on rent?

Misc 21%                                  

Rent 25%                                    25% of 100

Clothing 15%                             0.25 x 500 = $125

Savings 6%

Measures of Central Tendency Part 3

Outlier - a value that is much larger or smaller than the other data value

 the data may have more than 1 outlier or zero outliers

eg. outlier for - 3, 4, 5, 5, 6, 9, 33 is 33

Measures of Central Tendency Part 2

Mean - the sum of a set of values divided by the number of values in the set

eg. set is 6, 4, 8 and the mean is...

6 + 4 + 8 = 18

18 / 3 = 6

...therefore the mean is 6

Range - the positive difference between the largest and smallest values in a data set

eg. range of 1, 3, 4, 5, 5, 6, 6, 8, 8, 9 is...

9 - 1 = 8

...therefore the range is 8

Measures of Central Tendency Part 1

Median - the middle number in a set of data have been arranged in order

eg. median of 2, 5, 6, 8, 9 is 6

Mode - the most frequently occuring number in a set of data

eg. mode of 3, 5, 7, 7, 9 is 7

7. Practice Test Pg. 262-263

2. What is 1/3 + 1/4 written in lowest terms?

A 2/7 B 1/6 C 2/12 D 7/12 ✔

Number of the Day from Feb. 1, 2012

Today's Number is: 2873.459

1. Half of the number of the day is: 1436.7295

2. Write the number of the day in expanded form: 2000 + 800 + 70 + 3 + 0.4 + 0.05 + 0.009

3. Write the number of the day in written form: Two thousand eight hundred seventy three and four hundred fifty nine thousandths

4. Round to the nearest 100: 900

5. What digit is in the tenths place: 4

6. The number of the day doubled is: 5746. 918

8. Write a power using the digit in the 100th place as the base and the digit in the 10s place as the exponent: 57

9. Write the above power in factored form: 5x5x5x5x5x5x5

10. Cube the digit in the ones place: 27

11. Square the digit in the hundreds place: 64

12. Divide the number of the day by 3.55 and round to the nearest hundredth: 804.4

13. The product of all the digits is: 60 480

14. List all the prime numbers in the number of the day: 2, 7, 3, 5

16. (No answer because the whole isn't divisible by any of the numbers)

17. 37

20. Write a fraction using the 1000s place as the denominator and the tenths place as the numerator: 4/2

21. Use any two digits to make a proper fraction: 2/4

22. Use any of the digits to make a mixed fraction: 2 5/9

23. Write the answer to number 21 as a decimal: 2/4 = 0.5/1

24. 1/2

25. Write the answer to number 21 as percent: 50%

Bedmas Question from Feb. 1, 2012

(60-30) + 8 x 2 -4

(30) + 8 x 2 -4

(30) + 16 - 4

46 - 4

42

Numerical Coefficient

Numerical Coefficient - A number that multiplies the variable.

Variable and Expressions

Variable - The letter that represents an unknown number.

Eg. x, a, n, y

Expressions - Any single number or variable, or combination of operations (- , + , x , ÷) involving numbers and variables.

Eg. 5, n, 8t, x+1, 2y - 7

Textbook: Chapter Review

1. TEWLSO EMRTS

When the numerator and denominator of a fraction have no common factors other than 1. (Two words)

Answer: LOWEST TERMS

Adding Fractions with Like Denominators

You could simplify them. 4/9 + 2/9 = 6/9 or 2/3 <--(Simplified)

The denominators stay the same. Only the numerator adds.

1/4 + 2/4 = 3/4

Eg. 1/3 + 1/3 = 2/3

3/8 + 5/8 = 8/8 or 1

2. Min had a mark of 26 out of 31 on a science test. That same day, his sister got a mark of 45 out of 52 on a math test. Explain how to find out who got the better mark.

Min: 26 ÷ 31 = 0.838709677
= 83%

Sister: 45 ÷ 52 = 0.865384615
= 86%

Min's sister got a higher mark.

Math Textbook Pg. 138

A baseball player's batting average is the ratio of the number of hits to times a bat. It is usually expressed as a decimal number.

The following data are for one baseball season.
Player Times at bat Hits
A - 605 194
B - 624 197

a) What is the batting average for each player? Round each number to the nearest thousandth.
Player A: batting average - 0.320661157
rounded - 0.321

Player B: batting average - 0.315705128
rounded - 0.316

b) Which player had a better batting average for the season? Justify your response.
Player A got more in his average by 5 from Player B
Player B got a lower average by 5 to Player A

Order of Operations

4 x 3 + 12 ÷ 2
12 + 12 ÷ 2

12 + 6

18


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