# Chapter 1 - Mathematics - Oral Questions Flashcards

1
Q

Describe the result of adding a large positive number and a smaller negative number

A

result is smaller positive number, same as ignoring the signs and subtracting smaller number

2
Q

How do you convert a fraction into a decimal?

A

Divide the top number by bottom number

3
Q

What is the key step in order to add or subtract unlike fractions

A

finding the lowest common denominator

4
Q

How do you divide one fraction by another

A

Invert divisor (flip over the second fraction) and multiply both numerators and denominators (top and bottom numbers)

5
Q

How can you convert a decimal into a percent

A

Multiply decimal by 100 and add % sign, or

move decimal TWO places to the RIGHT and add %

6
Q

How do you convert a fraction to a percent

A

Convert to decimal, move decimal two places to the right, add %

7
Q

How do you change a decimal to nearest equivalent fraction

A

Multiply decimal by desired denominator, result becomes numerator of fraction (try to get closest to whole number)

8
Q

Two different ways a ratio can be expressed?

A

1- as a fraction
2- placing a colon between the numbers (5:54)
3- using the word βtoβ between the numbers

9
Q

What is a proportion?

A

a statement of equality (=) between two or more ratios:

1/2 = 4/8,

45/90 = x/100

10
Q

What is meant by the root of a number?

A

A root is two or more equal smaller numbers that when multiplied equal the specified number:

the second (square) root of 9 is 3,

the fifth root of 32 is 2

11
Q

How do you find the square of a number? Give an example.

A

multiply the number times itself-

4 X 4=16,

10 X 10= 100

12
Q

What is a common method of making computations involving very large or very small numbers more manageable?

A

Convert the numbers into scientific notation by using powers of 10.

7,234,000 = 7.234 X 106

13
Q

How is 100,000 expressed as a power of 10?

A

10 to the fifth

105

14
Q

what formula is used to find the area of a rectangle and of a triangle?

A

Rectangle Area = Length x Width

A = L x W

**Triangle **Area = 1/2 x Base x Height

A = .5 x B x H

15
Q

Define Pi

A

A constant that expresses the relationship between circumference and diameter of a circle, approximately 3.14159 (number of times the diameter goes into the circumference)

16
Q

Describe a trapezoid

A

A trapezoid is a closed, four-sided figure having two parallel sides and two sides that are not parallel.

17
Q

What is the formula for the area of a circle?

A

A = Pi x r2