Adding Whole Numbers and Money
Adding whole numbers and money reinforces place-value addition for Grade 6 Saxon Math Course 1 students. The addends are the numbers being added, and their result is the sum. The Commutative Property means 2 + 3 = 3 + 2, and the Identity Property means any number plus zero stays unchanged. Adding dollar amounts applies the same column-addition algorithm: dollars with dollars, cents with cents. These foundational properties underpin all arithmetic and algebraic reasoning throughout the curriculum.
Key Concepts
Definition To combine two or more numbers, we add. The numbers that are added together are called addends . The answer is called the sum .
Commutative Property of Addition : Changing the order of the addends does not change the sum. For example, $$ 4 + 5 = 5 + 4 $$.
Identity Property of Addition : If one of two addends is zero, the sum of the addends is identical to the nonzero addend. $$ 5 + 0 = 5 $$ What’s next Next, you'll see worked examples of adding whole numbers and money, and explore how addition relates to subtraction through fact families.
Common Questions
What are addends and the sum?
Addends are the numbers being added together; the sum is the result. In 4 + 7 = 11, both 4 and 7 are addends and 11 is the sum.
What does the Commutative Property of Addition say?
The order of addends does not change the sum: a + b = b + a. Example: 6 + 9 = 9 + 6 = 15.
What does the Identity Property of Addition say?
Adding zero to any number leaves it unchanged: a + 0 = a. Example: 15 + 0 = 15.
How do you add dollar amounts like $3.45 + $2.79?
Line up decimal points, add cents (45 + 79 = 124, write 24 carry 1), add dollars (3 + 2 + 1 = 6). Answer: $6.24.
What does carrying mean in column addition?
When a column sum is 10 or more, write the units digit and carry the tens digit to the next column to the left.