Podcast
Questions and Answers
In the equation $7 + 8 = 8 + 7$, which property of addition is demonstrated?
Commutative Property
In the equation $(7 + 8) + 4 = 7 + (8 + 4)$, which property of addition is demonstrated?
Associative Property
In the equation $858 + 0 = 858$, which property of addition is demonstrated?
Identity Property
What is the estimated sum of $1,837 + 4,349$ when rounding each number to the nearest ten?
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What is the actual sum of $1,837 + 4,349$?
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In the addition problem, how much money did the Animal Shelter receive in total?
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What is the property demonstrated in the equation $13 + 12 = 12 + 13$?
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The Identity Property of Addition states that adding zero to a number does not change the value of that number.
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When estimating the difference of $5,264 - 1,847$, what is the estimated difference after rounding each number to the nearest ten?
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What is the actual difference of $5,264 - 1,847$?
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Study Notes
2nd Quarterly Exam Reviewer - Mathematics 3
- Math Prayer: Student prays for grace, removal of sins, wisdom, understanding, to share blessings.
Second Quarter Topics
- Properties of Addition
- Addition (Actual and Estimated Sum)
- Mental Addition
- Addition Word Problems
- Subtraction (Actual and Estimated Difference)
- Mental Subtraction
- Subtraction Word Problems
- Two-step Word Problems involving Addition and Subtraction
Addition
- Addition Sentence: Includes addends, plus sign, equal sign, and sum.
- Example: 9 + 8 = 17 (9 and 8 are addends, 17 is the sum)
Properties of Addition
- Commutative Property: Order of addends does not affect the sum. (Example: 7 + 8 = 8 + 7)
- Associative Property: Grouping of addends does not affect the sum. (Example: (7 + 8) + 4 = 7 + (8 + 4))
- Identity Property: Any number added to zero equals the number itself. (Example: 45 + 0 = 45)
Identifying Properties of Addition
- Equations are given to identify the property of addition used. (Example: (6 + 2) + 10 = 6 + (2 + 10) - Associative property)
Addition Within 10,000
- Estimating sums by rounding to the nearest ten or hundred before addition.
Addition Word Problems
- Steps to solve addition word problems include reading, analyzing the problem, drawing a bar model, writing the addition sentence, showing the solution, and writing a complete answer.
Subtraction
- Subtraction Sentence: Includes minuend, minus sign, subtrahend, equal sign, and difference.
- Example: 8 – 5 = 3 (8 is the minuend, 5 is the subtrahend, 3 is the difference)
Subtraction Word Problems
- Steps to solve subtraction word problems include reading, analyzing the problem, drawing a bar model, writing the subtraction sentence, showing the solution, and writing a complete answer.
Two-Step Word Problems (Addition and Subtraction)
- Multiple operations (addition and subtraction) are involved in these problems requiring multiple steps to reach the correct answer.
- Various examples of two-step word problem scenarios are provided.
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Description
Prepare for the 2nd Quarterly Exam in Mathematics 3 with this comprehensive reviewer covering key topics such as properties of addition, subtraction, and word problems. Enhance your understanding of addition and subtraction through examples and important mathematical properties. Test your skills with practical exercises and enhance your problem-solving abilities.
