Monday 25 January 2010
Prime No.s (2)
Textbook p9 #25:
The Prime factorisation of a number is 2^4 X 3^5 X 7^2 X 11.
Write down 3 factors of the number that are greater than 100.
2x7x11=154
3x5x7=105
7x3x11=231
Textbook p9 #26:
The Prime factorisation of two numbers are 2 X 3^2 X 7^3 X 13 and 3 X 7^2 X 13^3 X 17 .
Write down 3 common factors of the numbers. 3,7,13
Prime No.s
Question:
A mathematician proposed that "Every even number greater than 2 can be expressed as a sum of prime numbers."
Do you agree? Why?
Ans:
Yes I agree.
Because 6=2+2+2, 8=5+3, 10= 5+5,10=3+3+2+2, 12=3+3+3+3, 12=3+3+2+2+2, etc.......
Saturday 16 January 2010
12 January: Numbers as a Language
We can use roman numerals, i have a programme (excel from my pri sch teacher) which can convert hindu-araibic to roman numerals and back, but it only works for Microsoft OS.
For more info you can go to http://en.wikipedia.org/wiki/Roman_numerals
2010 in roman numerals is MMX. ^.^
| Symbol | Value |
|---|---|
| I | 1 (one) (unus) |
| V | 5 (five) (quinque) |
| X | 10 (ten) (decem) |
| L | 50 (fifty) (quinquaginta) |
| C | 100 (one hundred) (centum) |
| D | 500 (five hundred) (quingenti) |
| M | 1000 (one thousand) (mille) |
| Symbol | Value |
|---|---|
| V or (V) | five thousand |
| X or (X) | ten thousand |
| L or (L) | fifty thousand |
| C or (C) | one hundred thousand |
| D or (D) | five hundred thousand |
| M or (M) | one million |
| ×1 | ×2 | ×3 | ×4 | ×5 | ×6 | ×7 | ×8 | ×9 | |
|---|---|---|---|---|---|---|---|---|---|
| Ones | I | II | III | IV | V | VI | VII | VIII | IX |
| Tens | X | XX | XXX | XL | L | LX | LXX | LXXX | XC |
| Hundreds | C | CC | CCC | CD | D | DC | DCC | DCCC | CM |
| Thousands | M | MM | MMM | IV | V | VI | VII | VIII | IX |
| Ten thousands | X | XX | XXX | XL | L | LX | LXX | LXXX | XC |
| Hundred thousands | C | CC | CCC | CD | D | DC | DCC | DCCC | CM |
For more info you can go to http://en.wikipedia.org/wiki/Roman_numerals
2010 in roman numerals is MMX. ^.^
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