Decimals, Fractions, and Percents

Question 1

Gross profit

Answer 1

Revenues minus expenses, or selling price minus cost

Question 2

principal (loan or investment)

Answer 2

The original loan or investment amount

Question 3

Simple annual interest

Answer 3

(principal) × (interest Rate) × (time)

Question 4

Compound interest

Answer 4

based on the principal plus any interest already earned

Question 5

Compound interest over n periods

Answer 5

(principal) × (1 + interest per period)^n − principal

Question 6

Trick for solving word problems with percents and fractions

Answer 6

Organize information in a table

Question 7

Equivalent Fraction

Answer 7

Same Number

Question 8

Reducing to lowest terms

Answer 8

Divide each fraction’s numerator and denominator by the greatest common divisor

Question 9

Greatest Common Divisor

Answer 9

Largest factor common to that numerator and that denominator

Question 10

reciprocal of fraction

Answer 10

​n / d​ is ​d / n​, if n and d are not 0

Question 11

mixed number

Answer 11

an integer next to a fraction

Question 12

consecutive integers

Answer 12

For any integer n, the numbers in the set {n, n + 1, n + 2, n + 3,…}

Question 13

If x and y are integers and x ≠ 0, then x is a divisor or factor of y if

Answer 13

y = xn for some integer n

Question 14

quotient

Answer 14

Dividing a positive integer y by a positive integer x, and then rounding down to the nearest nonnegative integer

Question 15

composite number

Answer 15

integer greater than 1 that’s not prime

Question 16

Squaring a number greater than 1, or raising it to any power greater than 1, gives

Answer 16

a larger number

Question 17

Squaring a number between 0 and 1 gives

Answer 17

a smaller number

Question 18

Number of square roots per positive number

Answer 18

Two, a positive and negative

Question 19

Number of cube roots per real number

Answer 19

one

Question 20

The square root of a negative number is

Answer 20

imaginary

Question 21

Rules of exponentiation

Answer 21

Question 22

scientific notation

Answer 22

a decimal is written with only one nonzero digit to the decimal point’s left, multiplied by a power of 10.

Question 23

Formula for the distance an object travels

Answer 23

distance = rate * time

Question 24

Finding object’s travel speped

Answer 24

distance / time

Question 25

Work problem

Answer 25

Basic formula is: 1/r + 1/s = 1/h

where r is how long an amount of work takes a certain individual, s is how long that much work takes a different individual and h is how long that much work takes both individuals working at the same time