Mathematics Flashcards
Describe the result of adding a large positive number and a smaller negative number.
The result is a smaller positive number, and is the same as ignoring the signs and subtracting the smaller number from the larger.
How do you convert a fraction into a decimal?
Divide the top number (numerator) by the bottom number (denominator)
What is the key step that must be performed in order to add or subtract unlike fractions?
You must find the lowest (least) common denominator.
How do you divide one fraction by another?
You invert the divisor and multiply the numerators together and the denominators.
How can you convert a fraction into a percent?
Convert it to a decimal, move the decimal point two places to the right and add the percent sign.
How can you convert a decimal into a percent?
(1) Multiply the decimal by 100 and add the percent sign. (or) (2) Move the decimal point two places to the right and add the percent sign.
How do you change a decimal into the nearest equivalent fraction?
Multiply the decimal by the desired denominator. The result becomes the numerator in the fraction.
What are two different ways that a ratio may be expressed?
(1) As a fraction. (2) By placing a colon (:) between the two numbers. (3) By using the word “to” between the two numbers.
What is a proportion?
A statement of equality between two or more ratios.
What is meant by the root of a number?
A root is two or more equal smaller numbers that, when multiplied together, equal the specified number.
How do you find the square of a number?
Multiply the number by itself.
What is a common method of making computations involving very large or very small numbers more manageable?
Convert the numbers into scientific notation by using powers of 10.
How is 100,000 expressed as a power of 10?
105 (10 to the 5th power).
What formula is used to find the area of a rectangle and of a triangle?
For a rectangle, A = L x W, For a triangle, A = 1/2 (B x H).
Define Pi.
Pi is a constant that expresses the relationship between the circumference of a circle and its diameter and is approximately equal to 3.1416.1
