How to improve my calculations?

Can someone please suggest me some easy ways to make my calculations quicker and more accurate?

  • Vivek
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  • 10 tricks for doing fast math:

    Here are 10 fast math strategies students (and adults!) can use to do math in their heads. Once these strategies are mastered, students should be able to accurately and confidently solve math problems that they once feared solving.

    1. Adding large numbers
    Adding large numbers just in your head can be difficult. This method shows how to simplify this process by making all the numbers a multiple of 10. Here is an example:
    644 + 238
    While these numbers are hard to contend with, rounding them up will make them more manageable. So, 644 becomes 650 and 238 becomes 240.
    Now, add 650 and 240 together. The total is 890. To find the answer to the original equation, it must be determined how much we added to the numbers to round them up.
    650 – 644 = 6 and 240 – 238 = 2
    Now, add 6 and 2 together for a total of 8
    To find the answer to the original equation, 8 must be subtracted from the 890.
    890 – 8 = 882
    So the answer to 644 +238 is 882.

    2. Subtracting from 1,000
    Here’s a basic rule to subtract a large number from 1,000: Subtract every number except the last from 9 and subtract the final number from 10
    For example:
    1,000 – 556
    Step 1: Subtract 5 from 9 = 4
    Step 2: Subtract 5 from 9 = 4
    Step 3: Subtract 6 from 10 = 4
    The answer is 444.

    3. Multiplying 5 times any number
    When multiplying the number 5 by an even number, there is a quick way to find the answer.
    For example, 5 x 4 =
    Step 1: Take the number being multiplied by 5 and cut it in half, this makes the number 4 become the number 2.
    Step 2: Add a zero to the number to find the answer. In this case, the answer is 20.
    5 x 4 = 20
    When multiplying an odd number times 5, the formula is a bit different.
    For instance, consider 5 x 3.
    Step 1: Subtract one from the number being multiplied by 5, in this instance the number 3 becomes the number 2.
    Step 2: Now halve the number 2, which makes it the number 1. Make 5 the last digit. The number produced is 15, which is the answer.
    5 x 3 = 15

    4. Division tricks
    Here’s a quick way to know when a number can be evenly divided by these certain numbers:
    10 if the number ends in 0
    9 when the digits are added together and the total is evenly divisible by 9
    8 if the last three digits are evenly divisible by 8 or are 000
    6 if it is an even number and when the digits are added together the answer is evenly divisible by 3
    5 if it ends in a 0 or 5
    4 if it ends in 00 or a two digit number that is evenly divisible by 4
    3 when the digits are added together and the result is evenly divisible by the number 3
    2 if it ends in 0, 2, 4, 6, or 8

    5. Multiplying by 9
    This is an easy method that is helpful for multiplying any number by 9. Here is how it works:
    Let’s use the example of 9 x 3.
    Step 1: Subtract 1 from the number that is being multiplied by 9.
    3 – 1 = 2
    The number 2 is the first number in the answer to the equation.
    Step 2: Subtract that number from the number 9.
    9 – 2 = 7
    The number 7 is the second number in the answer to the equation.
    So, 9 x 3 = 27

    6. 10 and 11 times tricks
    The trick to multiplying any number by 10 is to add a zero to the end of the number. For example, 62 x 10 = 620.
    There is also an easy trick for multiplying any two-digit number by 11. Here it is:
    11 x 25
    Take the original two-digit number and put a space between the digits. In this example, that number is 25.
    2_5
    Now add those two numbers together and put the result in the center:
    2_(2 + 5)_5
    2_7_5
    The answer to 11 x 25 is 275.
    If the numbers in the center add up to a number with two digits, insert the second number and add 1 to the first one. Here is an example for the equation 11 x 88
    8_(8 +8)_8
    (8 + 1)_6_8
    9_6_8
    There is the answer to 11 x 88: 968

    7. Percentage
    Finding a percentage of a number can be somewhat tricky, but thinking about it in the right terms makes it much easier to understand. For instance, to find out what 5% of 235 is, follow this method:
    Step 1: Move the decimal point over by one place, 235 becomes 23.5.
    Step 2: Divide 23.5 by the number 2, the answer is 11.75. That is also the answer to the original equation.

    8. Quickly square a two-digit number that ends in 5
    Let’s use the number 35 as an example.
    Step 1: Multiply the first digit by itself plus 1.
    Step 2: Put a 25 at the end.
    35 squared = [3 x (3 + 1)] & 25
    [3 x (3 + 1)] = 12
    12 & 25 = 1225
    35 squared = 1225

    9. Tough multiplication
    When multiplying large numbers, if one of the numbers is even, divide the first number in half, and then double the second number. This method will solve the problem quickly. For instance, consider
    20 x 120
    Step 1: Divide the 20 by 2, which equals 10. Double 120, which equals 240.
    Then multiply your two answers together.
    10 x 240 = 2400
    The answer to 20 x 120 is 2,400.

    10. Multiplying numbers that end in zero
    Multiplying numbers that end in zero is actually quite simple. It involves multiplying the other numbers together and then adding the zeros at the end. For instance, consider:
    200 x 400
    Step 1: Multiply the 2 times the 4
    2 x 4 = 8
    Step 2: Put all four of the zeros after the 8
    80,000
    200 x 400= 80,000
    Practicing these fast math tricks can help both students and teachers improve their math skills and become secure in their knowledge of mathematics—and unafraid to work with numbers in the future.

     

  • Improve Calculation Skill in 7 Steps:

    There are some easy step, by following which you can improve your calculation skills:

    1. Start With Easy Calculation:
    First, start with small and easy calculation like 300+550 =850, small multiplication and easy division etc. Do not start solving complicated calculation directly. Even if you know initial addition, subtraction, multiplication and division, then try to solve them quickly as much as you can.

    2. Learn Tricks For Large Multiplication Or Division:
    While doing large multiplication you can make use of tables or patterns, which make your calculation less time consuming and easy. Practice this pattern on table until you feel that you are perfect and can use it randomly at any time.
    Some more easy tricks for division are as follows:
    i) When number is divide by 2: if the last digit of the number is even number then is divide by 2.
    ii) When number is divide by 4 - If the last two digits of the number is divide by 4, then the number is divisible by 4.
    For example, we have 15237716 then 16 ÷ 4 = 4.
    iii) When divide by 5 - If the number ends with the 5 or 0 then that number is divide by 5.
    iv)When number is divide by 9 - if the sum of all the digits in the number is divisible by 9, then the number is divisible by 9.
    For example, we have 183321477 is divisible by 9
    =>1+8+3+3+2+1+4+7+7 = 36 and 36 ÷ 9 = 4.
    Same rule is use for the number 3.

    3. Write All Calculation:
    Whether you do your calculation in your mind or use some trick always try to write all the calculation. It makes your problem easier.

    4. Can Make Use Of Your Finger:
    Calculating in your finger is an old trick, but still its very useful. First, you have to learn how to count all the numbers on your fingers and then make use this to calculate the numbers.

    5. Game:
    Gaming is the best way to improve calculation skill. Game like chess in which it all comes down to the decisions you make based on the number of moves you can think ahead. Chess is all about the calculation you make in your head.

    6. Practice:
    You might have seen your math helper they hardly use calculator for calculation. This is because of the practice. Practice makes you perfect.

    7. Internet:
    Internet is the source for everything so it is best for improving your calculation skill too. Many free online math tutors are available you can ask them for the interesting calculation tricks.

    Hope it helps! 

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