SBAC Grade 8 Math 2

Question 1

What is the value of 3^4 × 3^2?

Accepted Answer

3^6

Answer

When multiplying powers with the same base, add the exponents: 4 + 2 = 6.

Question 2

Express 0.00056 in scientific notation.

Accepted Answer

5.6 × 10^-4

Answer

Move the decimal 4 places right to get 5.6, giving an exponent of -4.

Question 3

Which number is irrational?

Accepted Answer

√17

Answer

√17 is not a perfect square, so its decimal never terminates or repeats.

Question 4

What is (2^3)^2?

Accepted Answer

64

Answer

Multiply the exponents: 3 × 2 = 6, and 2^6 = 64.

Question 5

Between which two whole numbers does √50 lie?

Accepted Answer

7 and 8

Answer

Since 7^2 = 49 and 8^2 = 64, √50 is between 7 and 8.

SBAC Practice Test