How to Find the Prime Factors of a Number

A Prime Number can be divided evenly only by 1, or itself.  Example: 5 can only be divided evenly by 1 or 5, so it is a prime number. But 6 can be divided evenly by 1, 2, 3 and 6 so it is not a prime number (it is a composite number). A Composite Number can be divided evenly by numbers other than 1 or itself. Example: 9 can be divided evenly by 1, 3 and 9, so 9 is a composite number. But 7 can only be divided evenly by 1 and 7, so 7 is not a composite number (it is a Prime Number).  

If the integers p, p and p ¹ 0 dan p  ¹  1 only have 1 divider 1 and p, then p is called prime numbers. Integers other than primes are called composite numbers Examples of prime numbers: 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, ...etc. . Examples of composite numbers: 4, 6, 8, 9, 10, 12, 14, 15, 16, 18, 20, 21, 22, 24, 25, 26, 27, 28, 30, 32, 33, 34, 35, 36, ...etc.

A factor that is a prime number. One of the prime numbers that, when multiplied, give the original number.
Example:

The prime factors of 35 are 5 and 7 (5×7=35, and 5 and 7 are prime numbers).

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Time Measurement Unit

As we all know, that the unit of time that there are various ranging from seconds, minutes, hours, days, weeks, months, years, and others. 1 hour = 60 minutes, 1 minute = 60 seconds to, 1 hour = 60 x 60 seconds = 3.600 seconds. 1 year = 12 months, 1 month = 30/31 days.

For example:
23 hours = ... minutes ?
23 hours = 23 x 60 minutes = 138 minutes.
43 minutes = ... second ?
43 minutes = 43 x 60 seconds = 258 seconds.
7 hours = ... second ?

7 hours = 7 x 60 x 60 seconds = 25 200 seconds. (View from hours to seconds the stairs down two times, so it must be multiplied by as much as 2 times the value 60 as well).

1 Week = 7 Days
1 Month = 28 to 31 Days
1 Month = 4 weeks
1 Semester = 6 Months
1 year = 365 to 366 Days
1 year = 52 weeks
1 year = 12 months
1 decade = 10 years
1 century = 100 years
1 millennium = 1,000 years

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Temperature Conversion

Temperature is a quantity that express the degree of heat and cold an object is a tool used to measure the temperature of the thermometer. In everyday life people tend to measure the temperature using the sense of touch. But with the development of the technology was created to measure the temperature with a thermometer valid.

The following table shows the temperature conversion formulas for conversions to and from the Celsius scale.

Example :
Temperature in the living room is 86⁰F . Calculate the temperature of living room in the C and R !

• C: R: F = 5: 4: 9,  F = 86 ⁰
• C/F= C = 5/9(86 ⁰  -32 ⁰ ) = 5/9 x 54 ⁰  = 212 ⁰ C
• R/F=4/9 =R = 4/9(86 ⁰  -32 ⁰ ) = 4/9 x 54 ⁰  = 24 ⁰ R
• So, 86 ⁰ F =30 ⁰ C =24 ⁰ R

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Calculating the Area of a Square

In geometry, a square is a regular quadrilateral. This means that it has four equal sides and four equal angles (90-degree angles, or right angles). It can also be defined as a rectangle in which two adjacent sides have equal length. A square is quadrilateral (Quadrilateral just means "four sides" quad means four, lateral means side).with :

• Four equal sides and four equal angles
• Opposite side that are parallel
• Two diagonal that bisect at right angles
• Four lines of symmetry

The area of a square can be found by multiplying the base times itself. This is similar to the area of a rectangle but the base is the same length as the height.
If a square has a side of length 7 cm its area is 7*7=49 square cm.

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