Page 23 - BUSINESS MATHEMATICS MODULE 1 (WHOLE)_revised 10.20.2020

Course Guide

WALKTHROUGH
LESSON 2: FUNDAMENTAL OPERATIONS

A. ADDITION

Addition is the operation of combining numbers into an equivalent simple quantity

or number. M1_L1

In an addition equation, the numbers to be added are called addends and the result is

called the sum.

⏞ + ⏞ = M1_L2
⏞

There are three general properties in adding numbers. These are the commutative,
associative, and additive identity properties.

1. Commutative property: When two numbers are added, the sum is the SAME
regardless of the order of the addends.

For example: 4 + 2 = 2 + 4

6 = 6 ∎

2. Associative Property: When three or more numbers are added, the sum is the
SAME regardless of the grouping of the addends.

For example: (2 + 3) + 4 = 2 + (3 + 4)

5 + 4 = 2 + 7

9 = 9 ∎

Note: When adding several numbers, the Commutative and Associative Properties
allow us, to skip around to find combinations that make 10 or some other number

easier to add. (see Shortcuts in Additions)

3. Additive Identity Property: The sum of any number and zero is the original number.

(Adding 0 to a number does NOT change the number.)

For example: 5 + 0 = 5 ∎

Thus, zero (0) is called the Identity Number for addition.

LESSON 2: FUNDAMENTAL OPERATIONS 2.1 | P a g e