Get your fingers together and then reach your hand out and the sun will be set on your index finger. Then count the number of the fingers to the horizon. Each of the fingers adds approximately 15 minutes until sunset time.
On your fist start counting the months by your knuckles. The knuckle bump and the gap means a separate month. Once you finish one hand, proceed with the knuckles of the index finger. See the image.
When the month is on the knuckle bump there are 31 days in the month. When it is on the gap, then you have 30 or less days.
The moon phase can be determined by the shape of the letters D, O, and C. Full moon is O, first quarter is D, third quarter is C.
If you want to remember Roman numerals, then you can use that special phrase: Мy Dear Сat Loves Хtra Vitamins Intensely. Well, it sounds strange but the first letters of the words represent the Roman numerals in a simple descending order: M (1,000), D (500), C (100), L (50), X (10), V (5), I (1).
may be you have forgotten that trick but it is very easy to distinguish a good battery from a bad one. First Raise two batteries 1-2 cm above a table and them let them fall. The one which bounces and falls is the empty one.
Children can quickly remember the multiplication of small numbers, yet it is difficult for them to do so with the numbers 6, 7, 8, and 9. And that is possible with a simple trick - turn the palms to your face and number each finger from 6 to 10 starting with the little finger. The number of the fingers at the bottom, counting along with the connected ones, means tens (we got 5 of them). The fingers at the top, need to be multiplied among themselves and they mean units Thus you can quickly multiply by 6, 7, and 8.
For example, to multiply by 9, straighten your fingers and then put your hands on a table palms down. Now, to multiply any number by 9, just bend the corresponding finger. The fingers “before“ mean tens, and those ”after“ mean units. For example, to multiply 7 by 9, bend the 7th finger. 6 fingers remain “before” and 3 ”after." Thus we get the answer: 7×9 = 63.
The approximate measure of an object can be found out by useing the fingers of one hand. As a rule, the distance between the tips of the thumb and the forefinger is approx. 18 cm (7″), while the distance between the thumb and little finger is approx. 20 cm (7.87″).
That method is not absolutely accurate as there are different hand sizes. But still it is useful for measuring items.
First, spread your fingers as much as possible and then put your palm on a surface the angle of which you need to measure. The little finger should be on the bottom and it represents 0°. The angle between the thumb and the little finger is 90°, and thus the angles between the little finger and other fingers are as follows: 30°, 45°, 60°.