8th Grade Math Midterm Review

Front

What is scientific notation?

Back

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

Front

How do you multiply numbers in scientific notation?

Back

Multiply the coefficients and add the exponents. For example, (2x10^3) * (3x10^4) = 6x10^(3+4) = 6x10^7.

Front

What is the formula for finding the mass of multiple objects?

Back

Mass = Number of objects x Mass of each object.

Front

How do you solve a system of equations using substitution?

Back

1. Solve one equation for one variable. 2. Substitute that expression into the other equation. 3. Solve for the remaining variable.

Front

What is the square root of a number?

Back

A value that, when multiplied by itself, gives the original number. For example, the square root of 9 is 3.

Front

How do you determine the range of integers for a square root?

Back

Find two consecutive integers between which the square root lies. For example, √77 is between 8 (8x8=64) and 9 (9x9=81).

Front

What is the process for dividing numbers in scientific notation?

Back

Divide the coefficients and subtract the exponents. For example, (6.9x10^7) / (2.3x10^-3) = (6.9/2.3)x10^(7-(-3)) = 3x10^(7+3) = 3x10^10.

Front

What is a linear equation?

Back

An equation that makes a straight line when graphed. It can be written in the form y = mx + b, where m is the slope and b is the y-intercept.

Front

What does 'x' represent in a system of equations?

Back

'x' typically represents the number of one type of item or variable in a problem, such as the number of haircuts.

Front

What does 'y' represent in a system of equations?

Back

'y' typically represents the number of another type of item or variable in a problem, such as the number of hair dyes.