772-2011

Thursday, February 9, 2012

Variable- A letter that represents an unknown number

Expression- Any single or variable or combination of operations (- + x /) involving numbers and variables

Eg. 5 N 8+ + x 1 2y - 7

BEDMAS

How to answer an BEDMAS question

1. Do the the brackets first

2. Exponents, from left to right

3. Multiplication, from left to right

4. Divide,do from left to right

5. Add, from left to right

6. Subtract,do from left to right

There are 3 different kinds of fractions.

1. Proper -Where the top number (numerator) is less than the bottom number (denominator).

e.g. 4/7, 1/2, 9/15

2. Improper -Where the top number greater than the bottom number.

e.g. 6/3, 12/7, 4/3

3. Mixed -When there is a whole number with a proper fraction.

e.g. 1 and 1/2, 3 and 4/7, 5 and 8/12

Here's a video explaining Fractions!:

(It is kind of long so you may want to skip some parts that you don't need)

If you didn't understand Mr. Isfeld's explanation of the math term 'expression'. Try this link:

click here

How to add mixed numbers

Steps:

1.Deal with the fractions

2.Deal with whole numbers

3.Combine fractions and whole numbers

Example:

Q: A group of students are talking, 2 friends leave the group. Write an expression for the number of students in the group after the 2 leave.

A: R-2

'R' meaning the number of students in the group.

'R' is a variable. I used a variable because the number of students in the group are unknown.