Review of Addition
Review of addition is the foundational Grade 4 skill introduced in Saxon Math Intermediate 4 Chapter 1 that establishes the vocabulary and structure of addition. Addition is combining two groups into one, producing a sum from two addends. In 5 plus 3 equals 8, the addends are 5 and 3 and the sum is 8. Students practice writing number sentences and using column addition, including cases that require carrying. Mastery of addition facts and column alignment is the first step toward multi-digit arithmetic and algebraic reasoning.
Key Concepts
New Concept Addition is the combining of two groups into one group. What’s next Next, you'll apply this concept by writing number sentences, exploring addition's properties, and solving for missing numbers in various problems.
Common Questions
What are addends and a sum?
Addends are the numbers being added together. The sum is the result. In 5 plus 3 equals 8, both 5 and 3 are addends and 8 is the sum.
How do I add 12 and 9 using column addition?
Line up the ones: 2 plus 9 equals 11. Write 1 in the ones place and carry 1 to the tens. Then add tens: 1 plus 1 equals 2. The answer is 21.
Why does alignment matter in column addition?
Ones must be added to ones and tens to tens. Misaligning digits adds values from different place values together, producing an incorrect answer.
What is the relationship between addition and algebra?
Addition equations with unknowns, like 12 plus n equals 21, are simple algebraic equations. Solving for the missing addend introduces the core idea of variable-based reasoning.
What is the Commutative Property of Addition?
The order of addends does not change the sum. For example, 5 plus 3 equals 8 and 3 plus 5 also equals 8.