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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
Lesson 19 Written Practice
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
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?
If the perimeter of a square is 20 cm, what is its area?
2³ x 2² =
2⁶ ÷ 2² =
Prime and Composite
sieve of erastothenes
Prime and Composite Numbers
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.