2021 - 8th Grade Unit Test 1 Review (Real Numbers / Equation

Front

What are real numbers?

Back

Real numbers include all the numbers on the number line, including rational numbers (like integers and fractions) and irrational numbers (like √2 and π).

Front

Define rational numbers.

Back

Rational numbers are numbers that can be expressed as the quotient or fraction of two integers, where the denominator is not zero.

Front

Define irrational numbers.

Back

Irrational numbers are numbers that cannot be expressed as a simple fraction; they have non-repeating, non-terminating decimal expansions.

Front

What is scientific notation?

Back

Scientific notation is a way of expressing numbers that are too large or too small to be conveniently written in decimal form, using powers of ten.

Front

Convert 42,670,000 into scientific notation.

Back

Front

How do you convert a number into scientific notation?

Back

To convert a number into scientific notation, move the decimal point to create a number between 1 and 10, then multiply by 10 raised to the number of places the decimal was moved.

Front

What is the formula to find the time it takes for two objects moving at different speeds to meet?

Back

Set the equations of motion equal to each other and solve for time.

Front

If Mike is driving a boat at 12 mph and increasing speed by 0.5 mph each second, what is his speed after 9 seconds?

Back

Front

If Hank is driving a boat at 25.5 mph and decreasing speed by 1 mph each second, what is his speed after 9 seconds?

Back

Front

What is the mass of a textbook in scientific notation if it is approximately 0.00165 metric ton?

Back