These tricks we were taught in school, and they still work
Worldly wisdom is the understanding that most of the dangers, the expectation of which is a source of unrest, is not realized - Ilya Shevelev.
Some everyday tricks are so useful and simple that they can be useful for more than one generation. But over time, they somehow forget and turn into what is called "grandmother told me."
We at shram.kiev.ua decided to recall the past and collected for you tricks from childhood, which for some reason no one uses.
Determine the time before sunset
Fold your fingers together and stretch out your hand so that the sun "lies" on your index finger. Now count the number of fingers to the horizon line. Each of the fingers will be approximately 15 minutes before sunset.
Find the number of days in a month
Squeeze your hand into a fist and start counting the months by knuckles. Each knuckle and hollow is a separate month. If you count one hand, then, having reached the end, start again with the knuckles of the index finger.
If the month fell on the knuckle, then it is 31 days, and if the hollow is 30 or less.
Find out if the moon is growing or decreasing
To explain to the child, the moon grows or decreases, ask him to "put" a finger to the crescent moon in the sky. If the letter "P" is obtained, the moon grows, if "C" decreases.
The trick to memorize
To memorize Roman numerals and numbers, you can use this phrase: We Dari Juicy Lymon, Enough Vse Ix. The first letters in words mean Roman numerals in descending order: M (1000), D (500), C (100), L (50), X (10), V (5), I (1).
And, for example, remember which months are 30-day, you can use the word "apiyunseno" (the first letters in the names of the months).
Check the quality of the battery
Distinguishing a good battery from bad is very simple. Raise the two batteries 1-2 cm above the table and release. The battery that bounces and falls is discharged.
Another way is to lick the "+" finger battery. If the battery is charged, you will feel an unpleasant sour taste, and generally lick the batteries unhygienically.
Multiplication on the fingers
Usually children quickly remember the multiplication of small numbers, but with the numbers 6, 7, 8 and 9 there are difficulties. To help in this child, teach him a simple trick.
Turn your hands with your hands to yourself and number each finger, starting with the little finger, from 6 to 10. Now, for example, multiply 7 by 8, connect finger No. 7 on the left hand with finger No. 8 on the right. The number of fingers at the bottom, counting along with the connected ones, means dozens (we got 5 of them). And the fingers at the top should be multiplied among themselves - they denote units (in our case multiply 3 by 2). Answer: 7 × 8 = 56.
This way you can quickly multiply by 6, 7 and 8.
To multiply by 9, straighten your fingers, and put your hands with your hands down. Now, to multiply any number by 9, just bend the finger under the number of this number. Fingers "to" denote tens, "after" - a unit. For example, to multiply 7 by 9, bend the 7th finger. Remains 6 fingers "before" and 3 "after". We get the answer: 7 × 9 = 63.
If you need to approximately measure the object, but there is no ruler at hand, then you can do with the fingers of one hand. In accordance with the proportions of a person, the distance between the tips of the thumb and forefinger is about 18 cm, and the distance between the thumb and little finger is about 20 cm.
Of course, this method is not accurate enough, because each of us has a different hand size. But it can be useful if you need to measure a large object, and we only have a small ruler: just measure the distance between your fingers in advance.
Find out how many degrees in angle
Maximize your fingers and attach them to the surface on which you want to measure the angle. The little finger should lie on the bottom plane: it means 0 °. The angle between the thumb and the little finger will be 90 °, the angles between the little finger and other fingers are, respectively, 30 °, 45 ° and 60 °.
Via adme.ru & wiki