How Old Are You??

You can find your age with this trick :

1. Multiply the first number of your age by 5. (if your age is < 10, then the first number is 0; if your age is >99, example 115, then the first number is 11, the second number is 5).
2. Add 3 to the result.
3. Double the answer.
4. Add the second digit of the number to the answer.
5. Substract 6 from it.

The answer will be your age.. =D

Source : http://easycalculation.com/funny/tricks/age-calc.php

Tanggal lahirmu

Menghitung Tanggal Lahir

Bosen kan kl matematika cuma dipake untuk ngitung pelajaran?

Kita pake matematika buat 'main' yu. Tebak" an tgl lahir gt deh..

1. Ambil tanggal lahirny ya. (kl lahirny dibawah tgl 10, berarti 1 digit aja, ga usah dtambah 0 d depanny)

2. Kaliin 4.

3. Tambahin 13.

4. Kaliin lagi sama 25.

5. Kurangin 200.

6. Tambahin bulan kelahiran.

7. Kaliin 2.

8. Kurangin 40.

9. Kaliin lagi sama 50.

10. Tambahin sama 2 digit terakhir tahun kelahiran. (contoh tahun 1955, yang diambil cuma 55 ny aja) 

11. Kurangin deh sama 10.500.

12. Bener ga tanggalnya??

Seru kan? Matematika itu ga selalu nyebelin dan 'ga berguna' kan?

Ruth-Aaron Pair

Whoa, what is Ruth-Aaron Pair?
That is the first thing that crossed my mind when I saw it at wikipedia.

Well, after I read it, I came to this conclusion:

Ruth-Aaron pair consists of two consecutive integers (e.g. 135 and 136) for which the sums of the prime factors of each integer are equal. For example :

77 = 7 x 11
78 = 2 x 3 x 13

and

7 + 11 = 2 + 3 + 13 = 18

If only distinct prime factors are counted, the first few Ruth–Aaron pairs are:
(5, 6), (24, 25), (49, 50), (77, 78), (104, 105), (153, 154), (369, 370), (492, 493), (714, 715), (1682, 1683), (2107, 2108), (2299, 2300), (2600, 2601), (2783, 2784), (5405, 5406), (6556, 6557), (6811, 6812), (8855, 8856), (9800, 9801), (12726, 12727), (13775, 13776), (18655, 18656), (21183, 21184), (24024, 24025), (24432, 24433), (24880, 24881), (25839, 25840), (26642, 26643), (35456, 35457), (40081, 40082), (43680, 43681), (48203, 48204), (48762, 48763), (52554, 52555), (61760, 61761), (63665, 63666), (64232, 64233), (75140, 75141)

If counting repeated prime factor (e.g. 8 = 2 x 2 x 2 and 9 = 3 x 3; 2 + 2 + 2 = 3 + 3), the first few Ruth–Aaron pairs are:
(5, 6), (8, 9), (15, 16), (77, 78), (125, 126), (714, 715), (948, 945), (1330, 1331), (1520, 1521), (1862, 1863), (2491, 2492), (3248, 3249), (4185, 4186), (4191, 4192), (5405, 5406), (5560, 5561), (5959, 5960), (6867, 6868), (8280, 8281), (8463, 8464), (10647, 10648), (12351, 12352), (14587, 14588), (16932, 16933), (17080, 17081), (18490, 18491), (20450, 20451), (24895, 24896), (26642, 26643), (26649, 26650), (28448, 28449), (28809, 28810), (33019, 33020), (37828, 37829), (37881, 37882), (41261, 41262), (42624, 42625), (43215, 43216)

The intersection of the two lists begins:
(5, 6), (7,7, 78), (714, 715), (5405, 5406), (26642, 26643), (52554, 52555), (95709, 95710), (154842, 154843), (173162, 173163), (204258, 204259), (208581, 208582), (248109, 248110), (278277, 278278), (332994, 332995), (417162, 417163), (445305, 445306), (529194, 529195), (554682, 554683), (693610, 693611), (851709, 851710), (869054, 869055), (1232746, 1232747), (1252509, 1252510), (1275546, 1275547), (1275730, 1275731), (1549454, 1549455), (1600962, 1600963), (1607045, 1607046), (1671333, 1671334), (1672710, 1672711), (1777026, 1777027)


Ruth-Aaron Triplets also exist.
If only distinct prime factors are counted :
89460294 = 2 × 3 × 7 × 11 × 23 × 8419
89460295 = 5 × 4201 × 4259
89460296 = 2 × 2 × 2 × 31 × 43 × 8389
2 + 3 + 7 + 11 + 23 + 8419 = 5 + 4201 + 4259 = 2 + 31 + 43 + 8389 = 8465

151165960539 = 3 × 11 × 11 × 83 × 2081 × 2411
151165960540 = 2 × 2 × 5 × 7 × 293 × 1193 × 3089
151165960541 = 23 × 29 × 157 × 359 × 4021
3 + 11 + 83 + 2081 + 2411 = 2 + 5 + 7 + 293 + 1193 + 3089 = 23 + 29 + 157 + 359 + 4021 = 4589

If counting repeated prime factor:
417162 = 2 × 3 × 251 × 277
417163 = 17 × 53 × 463
417164 = 2 × 2 × 11 × 19 × 499
2 + 3 + 251 + 277 = 17 + 53 + 463 = 2 + 2 + 11 + 19 + 499 = 533

6913943284 = 2 × 2 × 37 × 89 × 101 × 5197
6913943285 = 5 × 283 × 1259 × 3881
6913943286 = 2 × 3 × 167 × 2549 × 2707
2 + 2 + 37 + 89 + 101 + 5197 = 5 + 283 + 1259 + 3881 = 2 + 3 + 167 + 2549 + 2707 = 5428

Until 2006, just 4 above triplets are known.

Source : http://en.wikipedia.org/wiki/Ruth%E2%80%93Aaron_pair

Twelve

First off all, I'm sorry if my English is bad, coz it's not my mother language. But I hope you understand what I mean.. :)

Hmm..

My thought began when people around me update their's status at 12 December 2012. What is so special with 12? Why a lot of couple got married at this date? Why a lot of Mom decide to have a caesarean section so her child born at 12 Dec 2012?

Let start with our body..

1. We have twelve pairs of ribs.

2. Human body have twelve cranial nerves.

3. Our's duodenum (from Latin which mean twelve), is about twelve inches long.

4. Average man has twelve pint of blood.

5. We have twelve joints on our fingers per hand.

Religion and Mythology..

1. There are twelve 'Jyotirlingas' (epitome of God Shiva) in Hindu Shaivism.

2. Jesus has twelve apostles.

3. Jacob has twelve sons, who were the progenitors of the twelve tribes of Israel.

4. Virgin Mary wearing a crown of twelve stars.

5. In Orthodox Judaism, twelve signifies the age a girl matures.

6. In Hinduism, Surya (the sun God) has twelve names.

7. There are twelve petals in Anahata (heart cakra).

8. In Shia Islam, propeth Muhammad had twelve successor known as Imams.

9. In Quran, the Sura number twelve is Sura Yusuf, and it's located in Juz'a number twelve.

10. Greek mythology has twelve olympians.

11. Odin has twelve sons.

12. Heracles (Greek mythology hero) was given twelve impossible task to completed.

Time..

1. Twelve hours for a half day.

2. There are twelve monts in a year.

3. Western and Chinese zodiak has twelve signs.

Traditions..

1. There are twelve days of Christmas.

2. Eastern Orthodoxy has twelve Great Feast.

3. Cubans bring in the New Year by eating twelve grapes to bring luck.

ETC..

1. Twelve is the largest number with a single morpheme name in English.

2. Twelve inches in a foot.

3. Twelve face cards in a card deck.

4. Twelve pence in a shilling.

5. King Arthur's round table had twelve knights.

6. Twelve people have walked on Earth.

7. There are twelve hues in the color wheel.

8. Twelve is the number of function keys on keyboards.

9. Twelve is the number of keys in any standard digital telephone.

10. Alcoholics Anonymous has twelse steps, twelve traditions, and twelve concepts for world service.

11. In ten pin bowling, twelve is the number of strikes needed for perfect game.

12. Twelve is a sublime number. 

So, want to feel the 12-12-12 again? You have to wait 100 years again.. ;)