Mathematics is a major branch of philosophy of science. Who became the mother of all sciences. Thus, the teaching of mathematics is one main thing in instilling the basic values of science.
Learning math is fun, because behind what we feel is difficult, presenting mathematical miracle in the calculation. There are a lot of fun in math calculations. Some of them can be seen in the descriptions below ini.Yok, see the joint!
Multiplication with the number eleven. There's magic in the way of multiplying a number by the number eleven. For example we would multiply 63 by 11, then 63 x 11 is ....
6 3 x 11 = 6 (6 +3) 3 = 693
2431 x 11 =
2. . .4. . . 3. . . 1 = 2 (1 +4) (4 +3) (3 +1) 1
= 2 6 7 4 1
2. Pengkuadratan number by the end of five. There's magic in the way mengkuadratkan a number by the end of five. You must already know that 5 squared = 5x5, so 5 squared = 25. How about 25 squares, 35 squares, or 65 squares? The way magic is:
25 squared = 2 x (2 +1) ... 25 = 6 25
To mengkuadratkan 25, take the first digit, ie two, and multiply by the number itself, ie after adding 1, 3.
Compose and save the results above with 25 behind it to obtaining the correct result.
35 squared = 3 x (3 +1) ... 25 = 12 25
To mengkuadratkan 35, take the first digit, ie 3, and multiply by the number itself, ie after adding 1, 4.
Compose and save the results above with 25 behind it to obtaining the correct result.
65 squared = 6 x (6 +1) ... 25 = 42 25
To mengkuadratkan 65, take the first digit, yaitu6, and multiply by the number itself, ie after adding 1, 7.
Compose and save the results above with 25 behind it to obtaining the correct result.
3. The difference of two squares. When there are two numbers diselisihkan squares, then the way is the second magic number is added, the two numbers multiplied by the result of these reductions. Suppose we want to know the results of the 25 squares - 24 squares, the way magic is:
25 squares - 24 squares = (25 +24) x (25-24)
= 49 x 1
= 49
4. Count to five. Dividing or multiplying by using numerical 5 can be made easier and faster if you recognize that the five possess a relationship with number 10. If we want to multiply 46828 x 5 magic way is to divide all numbers by 2, then put the number 0 behind when the final numbers which are an even number multiplied by five.
4 6 8 2 8 x 5 = ...
4:2 6:2 8:2 2:2 8:2 = 2 3 4 1 4 0
2 3 4 1 4
If we want to multiply 86849 x 5 magic way is to divide all numbers by 2, then put angka5 behind when the final numbers which are odd number multiplied by five.
8 6 8 4 9 x 5 = ...
8:2 6:2 8:2 4:2 9:2 = 4 3 4 2 4 5
4 3 4 2 4 remainder 1
5. Multiplying by the number 25. Multiplying a number by 25 can be done by dividing these numbers by four, when appropriate gone live plus zero zero behind it. Misala 28 x 25 then the result is 28 divided by 4 is 7, so 28 x 25 = 700. Another example of how to do 32 x 25 32 divided by 4 the result 8, so 32 x 25 is 800. When numbers are multiplied by 25 is divided by 4 remainder 1, then the result of the division was given 25, when the remaining two were given 50, when the remaining three were given 75. For example if 33 x 25, then the result is 825, because 33 divided by 4 is 8 remainder 1, so 32 x 25 = 825.
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