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# Ln20&21 mth7

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### Ln20&21 mth7

1. 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. 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. 3. Exponents; Rectangular Area; Square Root Lesson 20
4. 4. Vocabulary area base exponent exponential expressions square root
5. 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. 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. 7. Prime and Composite Prime Factorization Lesson 21
8. 8. Vocabulary composite factor tree prime factor prime factorization prime numbers sieve of erastothenes
9. 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. 10. Homework/Practice Homework: page 154 (1- 29 odds)