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Unsquaring Numbers

Unsquaring Numbers. Everyday Math Lesson 1.8. Lesson Objectives. I can tell the difference between powers of ten written as ten raised to an exponent. I can show powers of 10 using whole number exponents. Vocabulary. Add the following vocabulary word to your vocabulary chart: Square Root.

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Unsquaring Numbers

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  1. Unsquaring Numbers Everyday Math Lesson 1.8

  2. Lesson Objectives • I can tell the difference between powers of ten written as ten raised to an exponent. • I can show powers of 10 using whole number exponents

  3. Vocabulary • Add the following vocabulary word to your vocabulary chart: • Square Root

  4. Mental Math

  5. Math Message • Find the numbers that make these statements true. If you need counters, you may use them to help you. ___x ___ = 4 ___² = 81

  6. “Unsquaring” Numbers • What is the difference in squaring and unsquaring a number? • When you multiply a number by itself, you square the number. • 4 x 4 = p – Square the number 4 to find P • P = 16 • When you “unsquare” a number, you must undo the operation in order to find the number that was squared. • N * N = 16 • N = 4

  7. Let’s try some more! • In your work journal “unsquare” the following numbers: • 196 • 10,000 • 900 • 3, 136

  8. Your Turn • With your assigned partner, complete problems 1 and 2 on Student Journal Page 23. • You will have 15 minutes to work, when time is called be ready to share your answers.

  9. Finding the Square Root • How can we check our answers to problem one? • Multiply the square root of a number by itself. The symbol for square root is √ • You can use the square root key on your calculator to help you find these answers. • EX: 8² = 8 x 8 = 64 The square root of 8 is 64 and the square root of 64 is 8.

  10. Using the √ key on your calculator • Check your answers to problem 2 by completing the following: • Enter the number for which you are trying to find the square root. • Press the √ key, and then press = or enter. • If the answer is a whole number, then the number you entered is sqaure. • If the answer is a decimal number, the number you entered is NOT square.

  11. Your Turn! • With your assigned partner, complete Student Journal Page 23 problems 3-6. • You may also finish checking the answers to problem 2 with your calculators. • You will have 15 minutes to work, when time is called be ready to share your answers.

  12. Writing/Reasoning • Get out your Work Journal. • Write a response to the following: Was Jason correct when he said that 64 is a prime number in Problem 3? Explain your answer. Use vocabulary words when appropriate.

  13. Let’s Play Multiplication Top-It • Read the directions for playing this game on SRB page 333 and 334. • You will use a record sheet to keep track of the game. This will be your exit slip for today’s class.

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