# Math Help: Math Concepts to Remember

10/09/2015

## Helpful Math Concepts

Here are a few math concepts it helps to remember as you advance in your math studies.

### Vertical Angles

When two lines intersect to form an X, the angles formed opposite each other are called vertical angles. The two adjacent angles will always add up to 180 degrees. The vertical angles are always congruent, or equal to each other.

### Multiples & Factors

The multiples of x are the numbers you get when you multiply x by another integer. The multiples of 6 are 12, 18, 24, or -6, -12, and so on. Zero is a multiple of every number. Factors are the numbers you get when you divide x by another integer. The factors of 6 are 1, 2, 3, -6, -3, -2, and -1.

### Mean, Median, Mode

Mean is the same as average. Sum up the set and divide by the number of units in the set. To find the median, arrange the set from lowest to highest, and the median is the number in the middle. If there are an even number of quantities, take the average of the two middle numbers. The mode is the number that occurs most frequently in a set. If there is a tie, then there is no mode.

### Perpendicular Lines

Two lines that intersect at a 90 degree angle are called perpendicular. The slopes of these lines are negative reciprocals of each other. If the slope of one is 3, the slope of the other is -1/3.

### Remainder

The remainder is the whole number that remains after division. 10/3=3 and a remainder of 1. Put the remainder over the divisor to create a fraction or mixed number. 10/3=3+1/3.

## For Tutoring in Hoover

You can always get more math help at The Tutoring Center in Hoover. We have one-to-one tutoring in math, reading, writing, and more. Learn all about our academic programs from our webpage and call 205-987-9577 to schedule your free diagnostic assessment today.

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