> >Tricks from childhood, which for some reason everyone forgot
There are old everyday tricks that are passed on from generation to generation, sometimes they are forgotten, sometimes they are revived with a new force. But always remain interesting and useful.
Determine the time before sunset
Put your fingers together and stretch your hand so that the sun "lay" on the index finger. Now count the number of fingers to the horizon line. Each of the fingers will be approximately 15 minutes before sunset.
Find out the number of days in a month
Make a fist and start counting the months on the knuckles. Each knuckle and hollow is a separate month. If you count on one hand, then, after reaching the end, again start with the knuckle of your index finger.
If a month has fallen on a knuckle, then it is 31 days, and if it is 30 or less by a hollow.
And, for example, to remember which months are 30 days, you can use the word "apiyunseno" (the first letters in the names of the months)
Find out if the moon is growing or waning
To explain to the child whether the moon is growing or decreasing, ask him to “pin” a finger to the crescent in the sky. If the letter “P” is obtained, the moon grows, if “C” decreases.
Outwit the ancient Romans
To memorize Roman numerals and numbers, you can use the following phrase: We Darim Juicy Lemons, Enough Vs I. The first letters in the words mean Roman numerals descending: M (1000), D (500), C (100), L (50), X (10), V (5), I (1).
Check the quality of the battery
To distinguish a good battery from a bad one is very simple. Raise two batteries 1–2 cm above the table and release. That battery, which rebounds and falls, is discharged.
Another way is to lick the “+” finger-type battery. If the battery is charged, you will feel an unpleasant sour taste, and in general lick batteries unhygienically.
Multiplication on fingers
Usually, children quickly memorize the multiplication of small numbers, but with numbers 6, 7, 8 and 9 there are difficulties. To help this child, teach him a simple trick.
Turn your hands with your palms towards you and number each finger, starting from the little finger, from 6 to 10. Now, for example, multiply 7 by 8, connect the finger number 7 on your left hand with the number 8 finger on your right.The number of fingers below, counting together with the connected ones, means dozens (we have 5 of them). And the fingers located at the top, you need to multiply with each other - they denote units (in our case, multiply 3 by 2). Answer: 78 = 56.
In this way, you can quickly multiply by 6, 7 and 8.
To multiply by 9, straighten your fingers, and place your hands, palms down. Now, to multiply any number by 9, simply fold the finger under the number of this number. Fingers "to" denote dozens, "after" - units. For example, to multiply 7 by 9, bend the 7th finger. It remains 6 fingers "before" and 3 "after." We get the answer: 79 = 63.
If you need to measure an object approximately, but there is no ruler at hand, then for this 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 approximately 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 are in angle
Place your fingers as far as possible and apply 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 little finger will be equal to 90 °, the angles between the little finger and other fingers are, respectively, 30 °, 45 ° and 60 °.