2uandtrilogy.com

Fewer and fewer people are good at math these days.

Why ? Quite simply because we all have a calculator in our phone!

The problem is that you sometimes need to do calculations in your head.

Fortunately, there are some simple tips to help you do these complicated calculations without using a calculator.

Don't worry, these tips are child's play to understand and will make your daily life easier ...

... not to mention the fact that they will impress your friends!

here is 9 simple tips to never be bad at math again. Look :

1. How to multiply large numbers in your head

To multiply 97 by 96 in his head:

- I subtract 97 and 96 from 100:

100 - 97 = 3

100 - 96 = 4

- I add these 2 results:

3 + 4 = 7

- I subtract 7 from 100 to get the first two digits of the final result:

100 - 7 = 93

- I multiply the two results of step 1 to obtain the last two digits of the final result:

3 x 4 = 12

- The end result is 9312

Check out the trick here.

2. How to use your fingers for the tables of 6, 7, 8 and 9

To multiply 7 by 8, use your fingers:

- We already have the number 5 represented by the number of fingers on each hand. So to have 7 x 8, there are only 2 fingers on the left hand and 3 fingers on the right hand.

- Each finger is worth 10. So for the 5 fingers in total, that makes 10 + 10 + 10 + 10 + 10 = 50.

- The remaining fingers multiply one by one. So for the 3 fingers on the left hand and 2 fingers on the right hand, that's 3 x 2 = 6.

- It only remains to add these two results 50 + 6 = 56.

- We get the result of the multiplication of 7 x 8 = 56.

Check out the trick here.

3. How to never forget the 9 times table again

There is a simple and effective trick to never forget the 9 times table again:

- For the tens, write the numbers from 0 to 9 in column.

- For units, start at the bottom and go up from 0 to 9.

And there you have it, no need to worry about the table of 9!

4. How to add and subtract fractions easily

Here's how to add 2 fractions together. Let's take an example with 3/4 + 2/5:

- Start by placing them side by side: 3/4 + 2/5

- Then draw a circle diagonally between the top number of the first and the bottom of the second.

- Do the same with the remaining digits in the other direction.

- Multiply the digits of the first wing and the second.

- Write the result on the antennae of the butterfly, which makes 15 and 8.

- Then, connect the two lower wings to form the butterfly body and multiply the two lower digits, which makes 20.

- It is now enough to enter the number of the antennae at the top of the fraction, and the number of the body at the bottom, which makes 15 + 8 = 23 at the top and 20 at the bottom: 23/20.

To subtract, it's exactly the same method but subtracting the antennae of the butterfly.

5. How to multiply any number by 11

To multiply any number by 11, it's easy. Take for example 32 x 11:

- First separate 3 and 2.

- Add 3 + 2, which gives 5.

- Place this figure obtained in the middle of the two figures to be added.

- Results, that gives you 352, which is the result of 32 x 11.

6. How to calculate a head percentage easily

To calculate 40% of 300 head, nothing could be simpler.

- Take the first digit of the percentage (4)

- Multiply it with the first 2 of the number (30).

- Which gives 4 x 30 = 120.

7. How to find the fraction of a whole number easily

To find, for example, how many is 3/4 of 24, consider doing Zorro but backwards:

- Draw a line starting from the denominator (number at the bottom of the fraction) and going up to the whole number.

- Then ask yourself how many times there are 4 in 24.

- The answer is 6 times.

- Then draw a line to the numerator (at the top of the fraction) and multiply this number by 6.

- Draw a new line and write the result: 18.

- So the result of 3/4 of 24 is well 18.

8. How to convert degrees Celsius to Fahrenheit from head to toe

It's easy to convert degrees Celsius to Fahrenheit. Take for example 22 ° C:

- First multiply the temperature in Celsius by two, which makes 22 x 2 = 44.

- Add 30 to the result obtained, which makes 44 + 30 = 74 ° F.

To go from Fahrenheit to Celsius, do the same thing but backwards. Take for example 75 ° F:

- First remove 30 at temperature, which makes 75 - 30 = 45.

- Then divide this result by two, which makes 45/2 = 22.5 ° C.

This method gives a slightly approximate result (to within a few tenths of a degree), but at least the calculation is much easier than the real calculation method.

Indeed, the real method of calculation is to multiply by 1.8 and add 32.

9. How to remember which sign is "greater than" and which sign is "less than"

Your turn...

Have you tried these math tips to save time? Tell us in the comments if it worked for you. We can't wait to hear from you!

Do you like this trick ? Share it with your friends on Facebook.

Also to discover:

Simply the best Tip for Revising Math Classes.

Top 36 FUNNIEST Student Copies, It's Close to Genius!