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Elizabeth > Math > Flashcards

Math Flashcards

1
Q

How to find the perimeter of a triangle

A

Add all sides together

P = a + b + c

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2
Q

How to find the area of a triangle

A

Find half of the base times height

A = 1/2 (b x h)

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3
Q

How to find the perimeter of a quadrilateral

A

Add all the sides together

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4
Q

What is a quadrilateral?

A

Figure with 4 sides

Ex: rectangle, parallelogram, rhombus, square, trapezoid

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5
Q

What is a parallelogram?

A

Quadrilateral with opposite sides that are parallel and equal in length

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6
Q

What is a rectangle?

A

A parallelogram where all 4 sides from right angles (90 degrees)

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7
Q

What is a rhombus?

A

A parallelogram where all sides are equal in length

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8
Q

What is a square?

A

A parallelogram where all sides are equal in length and form right angles

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9
Q

What is a trapezoid?

A

A quadrilateral with only 2 parallel sides, sides do NOT have to be the same length

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10
Q

How do you find the area of a parallelogram?

A

Multiply base and height

A = bh

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11
Q

How do you find the circumference of a circle using the radius?

A

Multiply the radius and pi (3.14) and then double it (x 2)

C = 2( pi x r)

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12
Q

How do you find the circumference of a circle using the diameter?

A

Multiply the diameter by pi (3.14)

C = pi x d

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13
Q

How do you calculate tax?

A

Change the percentage to a decimal and then multiply with the price

Tax = 20%
Price = $100

20% —> 0.2
0.2 x $100 = $20

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14
Q

How do you find the volume of a rectangular solid?

A

Multiply length, width, and height

V = lwh

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15
Q

What does a ratio tell you?

A

How the quantity of 2 different things compares

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16
Q

How do you write a ratio?
There are 5 blue marbles and 10 red marbles? What is the ratio of blue to red marbles?

A

5:10 5/10 —> reduces to 1/2

17
Q

How do you read a ratio?
The ratio of cars to trucks is 2:3

A

There are 2 cars for every 3 trucks

18
Q

How do you reduce 25/75

A

Find the greatest common factor of 25 and 75 and then divide each side by that denominator.

GCF of 25 and 75 is 25
25 / 25 = 1
75 / 25 = 3
25/75 —> 1/3

19
Q

How do you reduce mixed numbers?
Reduce 2 8/20?

A

Convert the mixed number to an improper fraction, find the greatest common factor, and divide both sides, the convert back ti a mixed number if needed.

2 8/20 —> 48/20
GCF of 48 and 20 is 4
48 / 4 = 12
20 / 4 = 5
48/20 —> 12/5
12/5 —> 2 2/5

20
Q

How do you change a percentage to a decimal?
Change 52% to a decimal

A

You divide by 100
52/100 —> 0.52

21
Q

How do you change a percentage to a fraction?
Change 52% to a fraction

A

Put the percentage over 100 and simplify.
52/100
GCF is 4
52 / 4 = 13
100 / 4 = 25
52/100 —> 13/25

Elizabeth (2 decks)

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