Math TEAS

Integer

Any positive or negative whole number, include zero

Does not include fractions, decimals or mixed numbers (7x3/4)

Prime number

Any whole number greater than 1 that has only two factors: itself and 1

E.g. 3, 5, 7, 13…

Composite number

Any whole number that is not a prime number

Even number vs Odd number

Can be divided by 2; cannot be divided by 2

Decimal number

Any number that uses a decimal point

E.g. 1.2456

Decimal place

The position of a number to the right of the decimal point

E.g. 0.143

1 - tenths

4 - hundredths

3 - thousandths

Rational vs irrational numbers

Rational - include all integers, decimals and fractions

Irrational - cannot be written as a fraction or decimal, because the number of decimal places is infinite and there is no recurring pattern of digits

E.g. pi number 3.141592…

Real numbers

All irrational and rational numbers

Whole number

Can only be zero or positive natural numbers, but integers can also be negative natural numbers

Explain the number 4,546.09, location of each number and reading:

4: thousands

5: hundreds

4: tens

6: ones

0: tenths

9: hundredths

Reading: four thousand five hundred and forty-six and nine hundredths

Factors are numbers that are multiplied together to obtain a __________.

Product

Define common factor vs prime factor

Common factor is a number divided into two or more other numbers.

E.g. Factors of 12 are 1,2,3,4,6,12

Factors of 15 are 1,3,5, 15

Common factors of 12 and 15 are 1 and 3

Prime factor is also a prime number.

E.g. prime factors of 12 are 2 and 3

Greatest common factor (GCF)

GCF is the largest number that is a factor of two or more numbers.

E.g. Factors of 15 are 1,3,5,15

Factors of 35 are 1,5,7,35

GCF of 15 and 35 is 5

LCF is going to be the smallest number that is a factor of two or more numbers. Using the above example the LCF of 15 and 35 is 1

Lowest common multiple (LCM)

LCM is the smallest number that is a multiple of two or more numbers.

E.g. Multiples of 3 are 3,6,9,12,15,etc

Multiples of 5 include 5,10,15,20, etc

The LCM of 3 and 5 is 15

**To find the LCM of two numbers, just divide the answer by both numbers and see which one is divisible by both.

The result of an addition is the _________.

The result of a subtraction is the _________.

The result of a multiplication is the ________.

The result of a division is the _________.

A) Sum

B) Difference

C) Product

D) Quotient

PEMDAS

Parenthesis, exponent, roots, multiplication, division, addition and subtraction

How to simplify roots. The number on the outside is called index (e.g. 3)

(X/Y)

A fraction is a number that is expressed as one integer written above another integer. Top number is the numerator and bottom number is the denominator. Denominator cannot be 0.

Fractions written differently can be equivalent such as (2/10) = (3/15)

A fraction whose denominator is greater than its numerator is known as proper fraction.

Fraction in which the numerator is greater than its denominator is known as improper fraction.

A mixed number contains both an integer and a fraction.

E.g. 1(3/5) = 1 + (3/5) = 5/5 + 3/5 = 8/5

Adding or substracting fractions:

Must have the same denominator

(1/2)+(1/4) = (2/4 +1/4) = 3/4

Multiplying Fractions

(1/3) x (2/3) = (1×2/3×3) = 2/9

Dividing Fractions

(2/3)/(3/4) = (2/3)x(4/3) = (8/9)

Writing a Decimal

0.24 = 24/100 = 6/25

Irrational number examples

Square roots and pi

A proportion is a relationship between two quantities that dictate how one changes when the other changes. Can be direct proportion (same direction) or indirect proportion (opposite direction).

Matt drives his car 62 miles per hour on a 250-mile road trip from Arizona to California. He travels at a consistent speed the entire way. What is the constant of proportionality in this scenario?

62 miles

y=kx, in which y is the distance, 62 is the x and k is the hour.

Ratio is a comparison of two quantities in a particular order. E/g/ student to computer ratio is 20:14

What is not a proper way to write a ratio: A) 3/2; B) 3 over 2; C) 3:2; D) 3 to 2

Constant of proportionality exists when two quantities have a personal relationship. Represented by t = pn, in which p is constant.

For example, if the constant of proportionality is the price of lemons ($0.25/per lemon), then you can find the final cost based on the variable number of lemons you buy

Unit rate expresses a quantity of one thing in terms of one unit of another. For example, $2.75 for 5 eggs, unit rate is $0.55/egg

How to calculate the slope. Slope is between two consecutive points in a graph. If graph line is upward, slope will be positive. If graph line is downward, slope will be negative. Turn around to learn how to determine slope-intercept formula calculation

If two lines have the same slope, they are said to be perpendicular.

Remember, the Y number is always the second number within the parenthesis.

For standard form the slope is -A/B and the y-intercept is C/B

t = 1t, 1 is the constant term while t is the variable term

A single variable linear expression has only one variable term. E.g. 5x - 3 = 0

The equation ax + b =0 is referred to as one variable linear equation, in which the solution the root. E.g. 5x + 10 =0, the root is x = -2

The solution set comprises all solutions possible for one equation. When no solution is available if called an empty set.

Mathematical expressions that do not equal each other are called inequality. For example, 7x > 5.

If you multiply or divide inequalities by a negative number, the sign will flips sides, for example from > to <

Cartesian coordinate plate is used to show equations graphically.

Precision vs Accuracy vs Error

Precision - how reliable and repeatable the measurement is. (E.g. if I measure the amount of cells collected from the same volume)

Accuracy - how close the data is to the correct data. E.g. if people try to guess my height

Error - the amount of error in a physical measurement. Can be expressed as number ± (SD)

Rounding vs estimation

Rounding - reducing the digits in a number while still trying to keep the value similar

Estimation - use rounding to estimate the approximate value of the equation

All numbers must be rounded the same for an estimation!!

1 ft = 12 in

1 in = 2.54 cm.

1 ft² = 1 ft² × 12 in x 12 in = 144 in²

1 in = 2.54 cm

1 m = 100 cm

1 yd = 3 ft = 36 in = 0.914 m

1 mi = 5280 ft (mile) = 1.609 km

1 ac = 4840 yd² acre

1 mi² = 640 acres

1 m - 1000 mm

1 mm = 1000 um

1 km = 1000 m

Giga = 1 billion

Mega = 1 million

Kilo = 1 thousand

Deci = 1-tenth

Centi = 1-hundredth

Milli = 1-thousandth

Micro = 1-millionth

1 fluid oz = 29.573 mL

1 cup = 8 oz

1 pint (pt) = 16 oz

1 quart (qt) = 2 pints = 32 oz

1 gallon (gal) = 4 qt = 8 pt = 128 oz

1 tsp = 5 ml

1 tbps = 15-16 ml

1 cubic centimeter (cc) = 1 ml

1 L = 1000 mL

1 oz = 28.35 g

1 lb = 16 oz = 0.4536 kg

1 ton (tn) = 2000 lb = 907.2 kg

C → F (1.8 x ^oC) + 32

F → C 0.55 (^oF - 32)

How to calculate unique diagonals:

n(n-3)/2

Triangles

Trapezoids are a type of quadrilaterals.

A=1/2H(b + d)

Parallelogram

Rectangles: all rectangles are parallelograms and trapezoids

Rhombus: all rhombuses are parallelograms and kites

Square

Circle

The center of a circle is the single point from which every point on the circle is equidistant.

Diameter is equal to 2x the radius of the circle.

Volumes Formula

Review from book, some are wrong

The statistical mean is the same as the arithmetic average of that group.

It can be misleading as the sole measure of central tendency if the data gas outliers.

The statistical median is the value in the middle of the set of data. If there are an odd number of data values, the median is the value in the middle of the list. If there is an even number of data values, the median is the arithmetic mean of the two values.

The statistical mode is the data value that occurs the greatest number of times in the data set. It is possible to have exactly one mode, more than one mode, or no mode.

A measure of dispersion is a single value that helps to interpret the measure of central tendency by providing more information about how the data values in the set are distributed about the measure of central tendency.

1) Statistical Range - difference between the greatest and lowest values of the data in the set