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Chapter 2: Solving One-Step Equations and Inequalities 2.1 Properties of Numbers
Properties Commutative property of addition & multiplication: –Changing the order of the values you are adding or multiplying does not change the sum or product
Properties Associative properties of addition & multiplication –Changing the grouping of the values you are adding or multiplying does not change the sum or product
Example 1 Carlos rented a set of golf clubs for $7 and a golf cart for $12. He paid a greens fee of $23. Find his total cost.
Properties Identity properties of addition & multiplication –The sum of any number and zero is the original number –The product of any number and 1 is the original number
Example 2 Name each property shown: 5 · 7 = 7 · 5 c · 1 = c 7 + a = a + 7 5(xy) = (5x)y
Example 3 Use mental math to simplify: (81 + 6) + 9
Example 4 Suppose you buy the school supplies, a highlighter for $.85, an eraser for $.35, and paper for $1.65. Use mental math to find the cost of the supplies.
Example 5 Use mental math to simplify: (4 · 9) · 5
Example 6 Use mental math to simplify: 5 · 9 · 6 · (-2) · (-1)
Homework Questions. Clean off desk. Show all work. Homework Check.
Solving One-Step Equations and Inequalities-Chapter 2
© 2007 M. Tallman. Commutative Property © 2007 M. Tallman The order of the factors does not change the product × = factors product 5 × 3 = 3 ×
Properties of Equality
Twenty Questions Subject: Pre-Algebra Twenty Questions
Basic Laws Of Math x
Chapter 1-4: Properties Commutative Property: the order in which you add or multiply numbers does not change the sum or product Ex = * 8.
Solve the equation -3v = -21 Multiply or Divide? 1.
Lesson 2-1 Warm-Up. Lesson 2-1 Warm-Up Properties of Numbers (2-1) What are all of the properties of real numbers?
Solving One-Step Equations and Inequalities
Multiplying and Dividing Decimals
To identify basic multiplication facts and properties.
Warm Up 1. To which subgroups of the real numbers does each of the following belong? a. 8 b. -6 c ….. 2. Use an inequality to compare.
Fourth Grade Commutative Property of Multiplication Factors can be multiplied in any order and the product remains the same Example: 5 x 7 = 7 x 5.
Day Problems Simplify each expression – – (-8.4) 3. Evaluate each expression for a = -2, b = 3.5, and c = a – b + c5. |c + a + 5|
Properties of Real Numbers The properties of real numbers help us simplify math expressions and help us better understand the concepts of algebra.
Properties are special qualities of something. Addition and multiplication have special qualities that help you solve problems mentally = MENTAL MATH!!
1-4 Properties and Mental Math 9/20/11 Warm Up Find each sum or product (24) 4. 7(12) 5. 3(91) 6. 6(15)
Commutative, Associative, Identity & Zero Properties
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