8th grade Math Q2 Benchmark Review

8th grade Math Q2 Benchmark Review

Today we'll review our first semester in Math 8

Rational v. Irrational

• Rational numbers can be written as FRACTIONS

• Rational numbers include rational numbers (terminating or repeating decimals/fractions), Integer, Whole, Natural

• Irrational numbers are non terminating and non repeating decimals. Pi is a great example!

Multiple Choice

Which of the following is irrational?

• $\sqrt{16}$

• $\sqrt{4}$

• $\sqrt{144}$

• $\sqrt{3}$

Multiple Choice

Which number represents an integer?

• $\sqrt{2}$

• $\frac{10}{21}$

• $\sqrt{21}$

• -10

Multiple Choice

Simplify: (-4b³)(2b⁵)

• –2b¹⁵

• –8b⁸

• –2b⁸

• –8b¹⁵

Multiple Choice

Simplify

 $(5x^4)^{-3}$  

•  $\frac{1}{125x^{12}}$  

•  $25x^{12}$  

•  $125x^7$  

•  $125x^{12}$  

Multiple Choice

 $\frac{5a^7}{10a^3}$  

•  $2a^4$  

•  $\frac{1}{2a^4}$  

•  $\frac{a^4}{2}$  

•  $\frac{a^4}{5}$  

Multiple Choice

Simplify (-8a⁵b⁷)⁰

• 0

• 1

• -8

• $\frac{1}{-8a^5b^7}$

Multiple Choice

Write 34,600 in scientific notation.

• $3.46\ x\ 10^2$

• $3.46\ x\ 10^4$

• $34.6\ x\ 10^4$

• $346\ x\ 10^2$

Multiple Choice

 $What\ does\ 5.4\ x\ 10^{-2}\ represent?\$  

• .0054

• .054

• .54

• 54

Multiple Choice

What is 0.0000614 in scientific notation?

• $6.14\ x\ 10^{-5}$

• $6.14\ x\ 10^{-4}$

• $6.14\ x\ 10^{-2}$

• $.614\ x\ 10^{-4}$

Multiple Choice

Solve.

4 (2x - 7) = 36

• 8

• -8

• -64

• 64

Multiple Choice

-6x + 7 + 4x = 85

• 39

• 78

• -78

• -39

Multiple Choice

-3n + 9 = -5n - 17

• 1

• 26

• -13

• -26