Life will be easier with these interesting calculation and memory tips

Pocket now how to quickly calculate mental math as well as this precise time-determination tip.

Since ancient times, when modern technology was not developed, our father knew how to calculate, remember or determine time . with very simple and interesting tips.

Let's explore the very useful and simple tips below!

1. Determine the time left before sunset

When there are no devices that watch hours such as clocks or mobile phones, observing the Sun is a familiar way to determine the time of day.

You can use your hand to determine when the sun goes down.

Since a long time ago, people have discovered how to determine when the Sun goes down by method . using time to measure time.

Specifically, when the sunset is down, close your hand and hold it toward the Sun so that the edge of the little finger overlaps the horizon. When the edge of the upper index finger "touches" the Sun (as shown above), that means there is only one hour left. The Sun will set. Each of your fingers now represents 15 minutes before night falls.

2. Determine whether the Moon is missing or rounding out

Tips help determine whether the Moon is missing or rounding out.

Have you ever looked at a picture of a crescent moon and wondered if the moon was in the middle of a debilitating period or was it getting round? Don't rush to look up the Internet because there is a very simple determination trick.

Remember this 3 letters carefully: C, O and D!

The letter O is a full moon image. The letter C shows that the Moon is in a phase of gradual defect, while the D-shaped moon is in the rounding phase.

3. Tips to remember Roman numerals

Simple tips to remember the Roman numeral system.

It seems everyone can remember the symbol I, V, X is the Roman numeral that represents 1, 5 and 10. respectively. But are you confident of remembering the hundreds and thousands of digits written as how?

There is a very interesting trick to help you "want to forget it too" this Roman numeral system!

Remember the following English sentence:

"My Dear Cat Loves Xtra Vitamins Intensely" (Temporarily translated: My pet cat loves vitamin supplements).

The first letters of each word in the sentence represent Roman numerals in descending order: M (1,000), D (500), C (100), L (50), X (10), V (5), I (1).

4. Measure the degree of an angle with your hand

Place your hand so that the pinkie is parallel to the edge of any angle you want to measure and that convention is 0 °.

Open up your entire size and place your hand on the surface or corner you want to measure. Place your hand so that the pinkie is parallel to the edge of any angle you want to measure and that convention is 0 °.

At that time, the angle of formation between the thumb and pinkie will be approximately 90 °, the index finger, middle finger and the little finger will turn with the little finger approximately 60 °, 45 ° and 30 °.

5. Multiply with fingers

Usually we can easily remember multiplication with small numbers, but multiplication with numbers from 6, 7 . or more makes many people confused.

How to calculate and use 10 fingers.

There is a very simple trick that helps us mentalize when "forget the multiplication table" by using your fingers. Below is a way to calculate these 10 fingers to apply with multiplications from 6 to 10.

1. Spread your hands, so that your palms face your body and fingers against each other. First, remember which finger represents that number. Pinkie, ring finger, middle finger, forefinger and thumb represent 6, 7, 8, 9 and 10 respectively.
2. Touch the fingers representing the numbers you want to perform multiplication. For example, by multiplying 7x6 multiplication, touch the ring finger with the little finger.
3. Count the number of fingers on each table above two fingers that touch each other and multiply them together, being number 1
4. Counting the remaining fingers on each hand, each finger equals 10 units and then adding together we get a total of 2
5. Add the product 1 with the total of 2, we get the result of multiplication.

For example: do multiplication 7x8 =?

Example of multiplication 7x8.

1. Step 1: Touch 2 thumbs 7 and 8 together.
2. Step 2: Multiply the number of remaining fingers above the last 2 fingers (2x3 = 6)
3. Step 3: Count the remaining fingers on the hand, each finger is equivalent to 10 units. (5 fingers = 50 units)
4. Step 4: Finally add the last number with 6 we get the final result: 50 + 6 = 56. So the final result 7x8 = 56.