Trik Perkalian Cepat Part 1

in #arithmetic7 years ago

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Sadar atau tidak perkalian dengan angka lima banyak sekali dijumpai dalam kehidupan kita. Kita sering membeli barang berjumlah lima bukan? Misalnya sobat membeli buku harga 3600 sebanyak 5 buah. Cara perkaliannya cukup mudah, 5 adalah hasil dari 10/2. Jadi kita bisa ubah 3600 x 5 mejadi 3600 x 10/2 . Angka 36 kita bagi 2 dapat 18 terus kita tempelin tigal buah nol sisanya sehingga di dapat 18.000. Coba sobat amati 2 perkalian di bawah ini a. 44 x 5 = ......? b. 44 x 10/2 = ......? manakah yang lebih mudah?

Untuk angka 25 misal kita punya perkalian 16 x 25. Perkalian tersebut akan lebih mudah dikerjakan dengan mengubah 25 menjadi 100/4. Jadi 16 x 25 dalam pikiran sobat ubah menjadi 16 x 100/4. Angka 16 dibagi 4 dapat 4 terus tempelin deh 2 buah nol sisanya sehingga di dapat 400. Hahaha jenius bukan.. :D Cara ini bisa diterapkan juga untuk perkalian bilangan dengan bilangan 125. Angka 125 diubah menjadi 1000/8.

Trik 2 : Kuadrat Bilangan Berakhiran Angka 5
Hal unik soal angka lima tidak hanya terbatas pada trik nomor 1. Ada rumus cepat perkalian bilangan 2 digit yang berakhiran 5. Ketika ada 2 digit bilangan berakhirn 5 sobat kuadratkan pasti 2 angka terakhirnya 25. Sobat hanya perlu mengalikan bilangan digit pertama dengan bilangan yang lebih 1 dari bilangan tersebut kemudian tinggal ngikutin deh angka 25 dibelakangnya. Contoh 552 = 5x6 = 30 ---> tempelin 25 dibelakang menjadi 3025 752 = 7x8 = 56 ---> tempelin 25 dibelakang mejadi 5625 652 = 6x7 = 42 ---> menjadi 4225 952 = .... ayo sobat pasti sudah bisa nebak apa jawabnya..:D

Trick 3 : Perkalian Suatu Bilangan dengan Bilangan yang terdiri dari angka 9
Hayo cepat, 35 x 99 berapa? hahahaha asal sobat tahu perkalian tersebut bisa dengan mudah dihitung hanya dengan mengubah angka 99 menjadi (100-1) sehingga 35 (100-1) = 3500 - 35 = 3400 + 100 - 35 = 3465 (lakukan di pikiran sobat). Contoh lain 33 x 9 mejadi 33 (10-1) = 330 - 30 - 3 = 297. Sederhana bukan. Sekarang tanpa alat tulis coba sobat pikirkan hasil dari 52 x 99 ? kalau sobat menemukan hasil 5148 berarti sobat benar.

Trik 4 : Perkalian Cepat dengan Mengalikan Sebagian Faktor Pengali
Cara ini membantuk menyederhanakan perkalian sehingga sobat lebih mudah mengerjakannya. Kita ambil contoh perkalian 37 dengan 12. Sobat bisa menyederhanakannya dalam beberapa tahapan 37 x 12 .... 74 x 6 148 x 3 Jadi sobat akan lebih mudah mengalikan 148 dengan 3 dari pada 37 dengan 12. Kalu dicoret2 pakai porogapit lebih mudah perkalian dengan satu bilangan. Pada awal menggunakan cara ini sobat akan sedikit kesulitan tapi kalau sudah biasa bisa super cepat sobat melakukan perkalian.

Trik 5 : Jari Untuk Perkalian Angka 9 di Bawah 100
Ini trick jaman saya masih SD. Sobat bisa mengajari adik atau murid kelas cukup dengan menggunakan anugrah tuhan berupa 10 jari tangan. Cara cepat perkaliannya super gampang. Buka semu jari sobat.ketika perkali 9 x 5 maka lipat jari ke lima. Gabungkan jumlah jari di kiri dengan yang dikanan jari yang dilipat. Di sebelah kiri sisa 4 jari dan disebelah kanan utuh lima jari maka hasil dari 9 x 5 = 45. 9 x 8 berarit sobat lipat jari ke delapan disebelah kiri sisa 7 dan disebelah kana jari yang dilipat sisa 2 jari. So jawabannya 9 x8 = 72. Sangat ajaib buat adik-adik kita yang masih sekolah TK ada SD kelas 1. Okey sobat itu tadi trick sederhana yang bisa membuat kita melakukan perkalian dengan cepat. Wusss.. wusss... Selamat mencoba cara perkalian cepat tersebut. Wish U luck. :D


Tricks Multiplication Fast Part 1
Trick 1: Multiplication with Figures 5 and 25
Conscious or not multiplication with the number five is very much found in our lives. We often buy items amounting to five is not it? For example my friend bought the price book 3600 as many as 5 pieces. The way of multiplication is quite easy, 5 is the result of 10/2. So we can change 3600 x 5 to 3600 x 10/2. The number 36 we share 2 can be 18 we hold the remaining zero zero remaining so that it can be 18,000. Try my friend observe 2 multiplication below a. 44 x 5 = ......? b. 44 x 10/2 = ......? which is easier?

For the number 25 for example we have a multiples of 16 x 25. The multiplication would be easier to do by converting 25 to 100/4. So 16 x 25 in mind bud change to 16 x 100/4. Figures 16 divided by 4 can 4 hold tempelin deh 2 remaining zeros so that in can 400. Hahaha genius is not ..: D This method can be applied also to multiplication of numbers with the number 125. Number 125 changed to 1000/8.

Trick 2: Square of Number Ended Number 5
The unique thing about the number five is not just limited to the trick number 1. There is a fast formula multiplication of 2-digit numbers ending in 5. When there are 2 digit number ends 5 buddy squared must be 2 last digit 25. Buddy only need to multiply the first digit number with more number 1 of these numbers then stay ngikutin deh number 25 behind him. Example 552 = 5x6 = 30 ---> paste 25 behind to 3025 752 = 7x8 = 56 ---> tempelin 25 back to 5625 652 = 6x7 = 42 ---> 4225 952 = .... can guess what the answer ..: D

Trick 3: Multiplication of a Number with a Number consisting of the number 9
Hayo fast, 35 x 99 how many? hahahaha you know that multiplication can be easily calculated only by changing the number 99 to (100-1) so that 35 (100-1) = 3500 - 35 = 3400 + 100 - 35 = 3465 (do in mind buddy). Another example 33 x 9 becomes 33 (10-1) = 330 - 30 - 3 = 297. Simple is not. Now without stationery try to think about the result of 52 x 99? if you find the result 5148 means true pal.

Trick 4: Multiplication Fast by Multiplying Part of Multiplier
This method helps simplify multiplication so that my friend is easier to do. We take the example of multiplication 37 by 12. You can simplify it in several stages 37 x 12 .... 74 x 6 148 x 3 So buddy would be easier to multiply 148 by 3 from 37 by 12. Kalu dicoret2 use porogapit easier multiplication with one number. At the beginning of using this way my friend will be a little trouble but if it is common can super fast buddy do multiplication.

Trick 5: Finger For Multiplication Figures 9 Below 100
This trick my age is still SD. You can teach your siblings or classroom enough by using god's grace in the form of 10 fingers. How fast multiplication super easy. Open all fingers pal. When multiplying 9 x 5 then fold the fifth finger. Combine the number of fingers on the left with the fingertip dialing. To the left of the remaining 4 fingers and on the right intact five fingers then the result of 9 x 5 = 45. 9 x 8 a folding finger buddy finger to the left eight left 7 and next to the fingers that folded the remaining 2 fingers. So the answer is 9 x8 = 72. It is very magical for our brothers who are still in kindergarten school there is SD class 1. Okey buddy it was a simple trick that can make us do multiplication quickly. Wusss .. wusss ... Good luck how fast multiplication. Wish U luck. : D

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