# High School Math

MISSION STATEMENT: To encourage and promote a greater use of the internet and computer technology in the math classroom. For educators, students, parents and homeschoolers.

## Friday, April 21, 2006

### Javascript Magic

Use your Internet Explorer Browser as a Calculator!

Type this single line into the "Address" (URL) textarea
of your IE Browser and press Enter.
javascript:7+4
and you should get the answer 11 on the window page.

Now do the same for -

Now try these -
javascript:'Math Class'
javascript:Date()

Again, Type the following single line Math expression into the
javascript:Math.cos(1.5)

Now do the same for -

Also, type these inside the above two examples -

Math.abs(number) ....absolute value
Math.ceil(number) ....smallest integer >= number
Math.floor(number) ....largest integer <= number
Math.exp(number) ....e to the power of number
Math.log(number) ....natural log of number
Math.pow(base,exponent) ....base to exponent power
Math.max(number,number) ....greater of the two numbers
Math.min(number,number) ....smaller of the two numbers
Math.round(number) ....rounds the number to the nearest integer
Math.sqrt(number) ....finds the square root of the number
Math.PI .... pi (3.14159...)
Math.E ....e (2.718...)
Math.LN2 ....natural log of 2 (0.693...)
Math.LN10() ....natural log of 10 (2.302...)
Math.LOG10E() ....base 10 log of e (0.434...)
Math.SQRT1_2() ....square root of 1/2 (0.707...)
Math.SQRT2 ....square root of 2 (1.414...)

Contributed by www.TheMathWebSite.com.

## Friday, April 07, 2006

Do you want to know if this is a
good day to be taking that Math Test?
Are you on an intellectual high today?
You need to see your Biorhythm ! Yeah !

Go to www.TheMathWebSite.com. Enter the Index of Topics page.
Then click on Enrichment/Activities/Biorhythm.

## Thursday, April 06, 2006

### Binary Numbers

Binary numbers are written with two symbols 0 & 1.
Decimal numbers use the ten symbols 0,1,2,...8,9.
To represent numbers,
the decimal system uses the
powers of base 10 to an exponent,
the binary system uses
the powers of base 2 to an exponent.

(3274)10 represents the base 10 number 3274.
(1001)2 represents the base 2 number 1001.
3*102 represents 3 times base 10 to the exponent 2.

(1234)10
= 1*103 + 2*102 + 3*101 + 4*100
= 1000 + 200 + 30 + 4
= 123410
= 1234 the original base 10 number

(1101)2
= 1*23+ 1*22 + 0*21 + 1*20
= 8 + 4 + 0 + 1
= 1310
= 13 its base 10 number equivalent

(1010)2
= 1*23+ 0*22 + 1*21 + 0*20
= 8 + 0 + 2 + 0
= 1010
= 10 its base 10 number equivalent

Contributed by www.TheMathWebSite.com.

### Roman Numerals

I - I is 1, II is 2, III is 3.

V - V is 5. In front subtract. So IV means 4.
Behind add. - VI is 6, VII is 7, VIII is 8.

X - X means 10. IX is 9.
X's indicate the tens. So XXXI is 31, and XXIV is 24.

L - L means 50. XL is 40.
And 60, 70, and 80 are LX, LXX and LXXX.

C - C stands for centum, the Latin word for 100.
Words like "century" and "cent." XC is 90. CCCLXIX is 369.

D - D stands for 500. CD means 400. So CDXLVIII is 448.

M - M is 1,000. Ms are used to indicate dates.
For instance, 1998 is written as MCMXCVIII.

The big differences between Roman and Arabic numerals
are that Romans didn't have a symbol for zero

Contributed by www.TheMathWebSite.com.

## Tuesday, April 04, 2006

### Number Patterns

Pattern 1.
15,768 / 03,942 = 4
Note: The fraction above uses
all digits from 0 to 9 once.
Can you find another such fraction?

Pattern 2.
42 = 24,
is the solution to the equation ab = ba
Do any other values of a & b work?

Pattern 3.
(1 + 2 + 3 + 3 + 4 + 5)2
= 13 + 23 + 33 + 43 + 53

More Puzzles at www.TheMathWebSite.com.