Some Important Mathematical Concepts:
The Value Place concept
We need to understand the meaning of each digit of a number. For example, the numbers 437 and 374 have the same digit number. But the two numbers do not show the same number because the digits have different "place values".
At number 437, the number "7" is the unit. This equals 7 x 1 or 7. The number "3" is dozens. this is equal to 3 x 10 or 30. The number "4" is hundreds. This is equal to 4 x 100 or 400. Thus, the number 437 can be defined as 400 + 30 + 7. However, the number 374 equals 300 + 70 + 4.
Place value also applies to decimal places. Let's look at the numbers 5.29. The number "5" is the unit, and equals 5 x 1 or 5. The number "2" is the tenth. this equals 2 x 1/10, or 2/10. The number "9" is hundredth. This equals 9 x 1/100, or 9/100. Thus, the number 5.29 equals 5 + 2/10 + 9/100. Or it could be written 5 + 29/100.
Different Steps to Show the Same Rate
There are certain moments in writing numbers without changing the value. Mri we take the number 58. This number we can write to 58.0; 58.00; and so on, and the value is still 58. This number can also be written 058; 0058, and so on. The value is still 58. (Nevertheless, unusual number 58 is written 058 or 0058.)
Numbers Can Be Summed In Various Arrangements
We can add up a number of numbers in various arrangements with the same result. For example, the sum of 32 + 19 + 66 can also be written 66 + 32 + 19, or by four other means and still produce the same result, i.e. 117.
Numbers Can Be Multiplied In Various Arrangements
We can also multiply several numbers in several layers but still produce the same number. For example, an 8 x 13 multiplication can also be written 13 x 8 to produce an answer 104.
What is the Meaning of Squares of a Number?
When squaring a number, we multiply the two numbers themselves. For example, 8 2 </ sup> (called quadratic 8) equals 8 x 8, or 64.
Subtraction is the opposite of sum
A subtraction can be interpreted as the inverse of the sum. For example, 14 + 7 = 21. In other words, we can say that 21 - 7 = 14, and 21 - 14 = 7.
Division is the opposite of multiplication
The division can be interpreted as the opposite of multiplication. For example, 6 x 9 = 54. In other words, we can say that 54: 9 = 6, and 54: 6 = 9.
Division Can Be Shown In Three Different steps
We can show the division in three different ways. For example, 13 divided by 2 can be written to 13: 2 or 13/2. At school, we might learn that 13: 2 = 6 remainder 1. However, the answer is usually written 6.5 or 6 1/2.
How to Relationship between Decimal and Fractional
Numbers may be integers, such as 7, 18, and 206. Or the number is a number that lies between two integers, for example, 81.7 and 36 3/4.
As has been pointed out above that decimals and fractions are used to denote the part of a single integer. We need to know that what is the meaning and how a fraction can be represented as a decimal or otherwise.
Quick Exercises
Whenever completing a calculation, we should always check it quickly to see if our answer is correct. For example, suppose we have done the sum of 93 by 98 and got the result 201. You must know that the two numbers are less than a hundred. So, the amount is certainly less than 200. Therefore, the number 201 is too much. (The correct result is 191).
Rapid exercise should also be applied in multiplication, division, subtraction, and squaring. Sometimes it is difficult to apply quick practice, especially if the numbers are large. However, by practicing, we will be able to quickly figure out the wrong answers. If this is the case, it's easy. Repeat the count until it is correct.
This is all I can say in my post this time, the basic steps about mental mathematics I will point out in the next post. Hopefully, this article useful for me personally and for you all.
Source :
- Julius, Edward, 2002, Trik-trik Berhitung.
