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Table of Contents
Finding an unknown number in an equation means relating a set of numbers in a fact family. At the end of the lesson, the student will be able to determine the whole unknown number in a multiplication or division equation relating three whole numbers
See the fact file below for more information on the finding unknown values or alternatively, you can download our 26-page Operations and Algebraic Thinking: Finding Unknown Values CCSS 3.OA.4 worksheet pack to utilise within the classroom or home environment.
Key Facts & Information
LEARNING OBJECTIVE
- At the end of the lesson, the student will be able to determine the whole unknown number in a multiplication or division equation relating three whole numbers.
A NOTE FOR THE TEACHER
- When finding unknown values, take note of the following:
- Remember that if the missing number is the product or quotient, do the necessary operation. If the missing number is a multiplicand or multiplier, divide the product by the known factor. If the missing number is a dividend, multiply the divisor and the quotient. If the missing number is a divisor, divide the dividend by the quotient.
THEORY
- Finding an unknown number in an equation means relating a set of numbers in a fact family:
- a x b = c b x a = c c ÷ a = b c ÷ b = a
- Since multiplication and division are related to each other, we can interchange the numbers used. Remember that the product becomes the dividend, while the factors become the divisor and the quotient. The quotient can be the multiplicand if the dividend and the divisor are the multipliers and the product.
- If the missing number is the product or quotient,
- do the necessary operation.
- For example,
- If the missing number is a multiplicand or multiplier, divide the product by the known factor.
- For example, 2 x ? = 10
- Dividing 10 by 2 will produce 5
- Thus, 2 x 5 = 10
- If the missing number is a dividend, multiply the divisor and the quotient.
- For example, ? ÷ 4 = 3
- Multiplying 4 and 3 will produce 12
- Thus, 12 ÷ 4 = 3
- If the missing number is a divisor, divide the dividend by the quotient.
- For example, 15 ÷ ? = 5
- Dividing 15 by 5 will produce 3
- Thus, 15 ÷ 3 = 5
Operations and Algebraic Thinking: Finding Unknown Values CCSS 3.OA.4 Worksheets
This is a fantastic bundle that includes everything you need to know about Operations and Algebraic Thinking: Finding Unknown Values across 26 in-depth pages. These are ready-to-use worksheets that align with the Common Core CCSS code 3.OA.4 for Operations and Algebraic Thinking: Finding Unknown Values.
Table of contents:
- A lesson plan
- Warm-up activity
- Math theory explained
- Assisted learning activities
- Independent learning activities
- Extension activities and games
- Answer keys
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Use With Any Curriculum
These worksheets have been specifically designed for use with any international curriculum. You can use these worksheets as-is, or edit them using Google Slides to make them more specific to your own student ability levels and curriculum standards.