7 Math Tips You Wish they Taught in School.

  karma level 72538

It’s been a while since we attended school and age hasn’t been kind to our memory either. As time passes, most of us lose most of our mathematical abilities leading us to rely more and more on calculators. If you want to improve your math skills and even be able to help your kids, learn how to use these quick and easy methods.

1. Calculate multiplications of 6,7,8,9 by using your fingers
Did you ever memorize the classic multiplication table? While calculating multiplications of 1-5 are usually easy, when we go to 6 and higher, many of us start to stutter. This easy method is not taught in most schools, but it’s very quick and intuitive:
  • Assign numbers to every finger, the pinky being number 6 and the thumb being number 10 .

  • If you wish to calculate 7x8 (pictured below), touch the assigned fingers.

  • The number of fingers below, including the touching fingers, is the tens. (Pictured below, 5 fingers = 5 tens or 50 )

  • Now, multiply the remainder fingers to find the units. (in the example, 3 fingers multiplied by 2 fingers = 6 )
  • Add the units to the tens, and you have the result – 56 .

2. Quickly calculate multiplications of 9
To calculate the multiplications of nine, you just need to remember that the tens increase and the units decrease , and the sum of the total always equals nine.
3. Calculating multiplications of eleven with 2-digit numerals
  • This calculation takes two simple steps:
  • In the first step, split the digits, then one becomes the hundreds, the other becomes the units.
  • In the second step, sum the digits and the result becomes the tens.

4. Quickly calculate fractions
Even though fractions are not something most of us deal with on a daily basis, this method is very useful, especially for school-age children.
  • Turn the multiplication into a “butterfly” by drawing diagonal ellipses, then multiplying the digits in each ellipsis. (In the example below, 3x5 and 4x2 )
  • Write the results down in the appropriate “feeler”.
  • Multiply the denominators and write it under the butterfly. (In the example, 4x5=20 )
  • You now have the common denominator (20), and by adding the two numbers on the top of the butterfly, you have the numerator. (In our example, 15+8=23 )
  • You can now simplify the fraction from  to .
  • This method also works when you want to subtract fractions, but to do this, you will need to subtract the top numbers instead of adding them.
    (In our example, 15-8=7 )
5. Multiplying double-digit numbers
Multiplication can become harder when the numbers get bigger, but it doesn’t have to be. This method will help you get over this, and you’ll find that the larger the number – the easier it gets:
  • Subtract 100 from each number.
  • Add the results, and then subtract it from 100. The result will become the thousands and hundreds digits.
  • Now multiply the two first results and you’ll get the tens and units.

6. Multiplying double and triple-digit numbers
Another method to multiply double-digit numbers is the “line method”, which also works on multiplying triple-digit numbers. It is vital that you remember to maintain a left-to-right writing direction, even when drawing the lines:
  • Begin by drawing diagonal lines to represent each digit. The other number will be drawn in a crisscross manner shown in the example below.
  • Split the drawing into three sections. Each of the three areas represents the hundreds, tens, and units.
  • Count each cross-point in each section and write them down one after the other. (Left= 1 , middle= 6 , right= 8 )
  • And your answer is 168 .
To do the same for a triple-digit number, follow the same method, but notice that now you will have 4 sections instead of 3.
7. For kids: How to write “greater than”
  • Think of the sign as a hungry mouth that always wants to eat the bigger number!

Related Entries

Mathematics of life!
by Blue on Jul/18,2014 ( diamond user)
Schools with crazy names.
by Nuzhat Ny on Nov/02,2011 ( diamond user)
Tips & tricks to remove depression
by Venkata Subramanian on Aug/01,2011 ( platinum user)
Wishing you Happy New Year 2012
by Rupesh on Dec/05,2011 ( diamond user)
Tips for Getting a Good Night Sleep.
by Raj Kumar on Feb/04,2015 ( diamond user)
Tips for Handling Telemarketers
by Toddler13 on Mar/17,2012 ( diamond user)
Beauty Skin Care Tips.
by Panther on Apr/13,2012 ( diamond user)
12 Tips on Staying Inspired.
by Monika on Jun/28,2014 ( diamond user)
cheerful Mathematics
by Nma.Nadaf on Oct/30,2013 ( diamond user)
13 Japanese Diet Tips To a Healthier life.
by Monika on Feb/08,2015 ( diamond user)
Health Tips...
by Nma.Nadaf on Feb/15,2013 ( diamond user)
Laughing Mathematical Concepts
by Portonovo Kajanazimudeen on Aug/02,2009 ( diamond user)
Environmentally friendly School in Bali
by Bikash Chetry on Dec/11,2010 ( diamond user)
Shhh.. they are sleeping.
by Dileesha Lakshan on Nov/20,2010 ( diamond user)
Tips to sleep at your desk.
by Monika on Jul/08,2014 ( diamond user)
Admin on Jun/10,2007  
What British say and what they really mean?
by Toddler13 on Aug/02,2014 ( diamond user)
Tips for filling petrol and diesel.
by Panther on Oct/23,2013 ( diamond user)
Mathias Schittle - Real Life Pompeye.
by Monika on May/14,2013 ( diamond user)

Random Pics

Share this with friends

Your Name:
Your Email:

Friends Email: (Atleast 1)

Subscribe for more Fun

Receive best posts in your inbox.

Confirm email
Your Email

Add Your Comments

comments powered by Disqus
User generated content. Copyright respective owners wherever applicable. Contact - admin at binscorner