• Thirty days hath September,

April, June, and November.

All the rest have thirty-one,

Except February, which has 28—

or in a leap year 29.

FACTORS are numbers that are multiplied

MULTIPLES are products of two numbers

DIVIDEND is the number BEING divided

DIVISOR is the number doing the dividing

HORIZONTAL lines extend left and right

VERTICAL lines extend up and down

OBLIQUE lines appear slanted

#### PERPENDICULAR lines intersect & form right angles

NUMERATOR is the number UP

DENOMINATOR is the number Down

multiplication, and division

PARENTHESES show order (do first)

Order of Operations:  PEMDAS

Parentheses

Exponents

Multiplication/Division

0 - 4  stay the same

5 - 9  go up one

1 min = 60 sec

1 hr = 60 min

1 day = 24 hrs

1 week = 7 days

1 month = 4 weeks

1 yr = 52 weeks

1 yr = 12 months

common year = 365 days

leap year = 366 days

1 century = 100 years

1 millennium = 1,000 years

1 cm = 10 mm

1 m = 100 cm

1 m = 1,000 mm

1 km = 1,000 m

1 L = 1,000 mL

1 g = 1,000 mg

1 kg = 1,000 g

PERIMETER is the distance around an object

AREA is the size of the inside of a flat shape

A = lw

VOLUME is the amount of space something occupies

CIRCUMFERENCE is the distance around a circle

1 ft = 12 in.

1 yd = 3 ft

1 mi = 5,280 ft

1 mi = 1,760 yd

1 cup = 8 oz

1 pt = 2 cups

1 qt = 2 pt

1 gal = 4 qt

1 lb = 16 oz

1 ton = 2,000 lb

PRIME numbers have exactly two factors

COMPOSITE numbers have more than two factors

RECIPROCAL is reversing the numerator and the

denominator

GCF is the Greatest Common Factor

#### LCM is the Least Common Multiple

triangle has 3 sides

square has 4 sides

rectangle has 4 sides

pentagon has 5 sides

hexagon has 6 sides

heptagon has 7 sides

octagon has 8 sides

nonagon has 9 sides

decagon has 10 sides

SQUARE NUMBER is the number you get when you multiply an integer by itself.

1, 4, 9, 16, 25, 36, 49, 64, 81, 100, 121, 144

1-January, 2-February, 3-March, 4-April, 5-May, 6-June, 7-July,

8-August, 9-September, 10-October, 11-November, 12-December

WINTER:  December, January, February

SPRING:  March, April, May

SUMMER:  June, July, August

FALL:  September, October, November

Roman Numerals

1 – I

2 – II

3 – III

4 – IV

5 – V

6 – VI

7 – VII

8 – VIII

9 – IX

10 – X

50 – L

100 – C

500 – D

1,000 – M

5,000 – V (V with a line on top)