Download Lesson 1-5 to Lesson 1-8

Name:
Math: Chapter 1B - Review
Date:
Period:
1-5 Order of Operations (PEMDAS)
25  5 + 6 x (12  4) parentheses first
25  5 + 6 x 8
no exponents, so multiply and divide from L
5 + 48
add and subtract from L
R
53
1. P
parentheses first
( )
2. E
exponents/powers
23
3. MD
multiply and divide from left to right
x, 
4. AS
add and subtract from left to right
+, 
1-6 Variables and Expressions
Evaluate if m = 3 and k = 10
Variable - a letter that represents a number
Evaluate – solve the problem
1) substitute values
2) solve using PEMDAS (order of operations)
1-7 Solving Equations
k2  (2 + m)
102  (2 + 3)
102 
5
100 
5
20
substitute values
parentheses first
exponents
multiply and divide from L
SIDE BY SIDE - MULTIPLY
Equation – a sentence that has an equals (=) sign
Solution - answer or value
1) use basic math facts OR
use inverse operation
2) does your answer make sense
35 – a = 25
35  10 = 25
a = 10
100 = 75 + w
100 = 75 + 25
w = 25
1-8 Area of Rectangles
Area - the number of squares needed to cover something
Find the area of the rectangle.
1) use the formula
(A = length  width)
2) answer is always in square units
5 in.
10 in.
A=lw
A = 5 in.  10 in.
A = 50 square inches
R
R