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# Ln20&21 mth7

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• 1. Problem of the Day The triangle above is rotated 90ᵒ clockwise three times. Draw the shape of the triangle in the correct position after each turn.
• 2. Lesson 19 Written Practice 1) 7/8 3) 504 legs 5) a. eighteen million, seven 17) 23 hundred b. (8x100) + 19) 2 (7x10) + (4x1) 21) 2/7 7) 32ᵒF, 212ᵒF 23) 2500 9) a. 3 2/3 b. 5/8 c. 1/25 25) a. 2 b. 10 11) figure A because it is not a 27) 10/3 x 3/2 = 30/6 = 5 2-dimensional figure 29) 33 1/3% 13) a. 90ᵒ b. 360ᵒ 15) 7451
• 3. Exponents; Rectangular Area; Square Root Lesson 20
• 4. Vocabulary area base exponent exponential expressions square root
• 5. Exponents; Rectangular Area; Square Root What do you think an exponent shows? When the base is a fraction, why is the fraction in parentheses? What is a perfect square? What is the rule for multiplying exponential expressions with the same base? What is the rule for dividing exponential expressions with the same base? What are some real-world situations in which you might ﬁnd the area of rectangles? What’s the difference between perimeter and area? What is the formula for the area of a rectangle? square? What is the inverse operation of squaring?
• 6. Practice If the perimeter of a square is 20 cm, what is its area? (1/2)² = 2³ x 2² = 2⁶ ÷ 2² = √400 = √15² =
• 7. Prime and Composite Prime Factorization Lesson 21
• 8. Vocabulary composite factor tree prime factor prime factorization prime numbers sieve of erastothenes
• 9. Prime and Composite Numbers Prime Factorization List the ﬁrst ten prime numbers. If a whole number greater than 1 is not prime, then what kind of number is it? Write the prime factorization of 81. Write the prime factorization of 360. Find the GCF of 81 and 18.
• 10. Homework/Practice Homework: page 154 (1- 29 odds)