The lessons learned at school are seldom forgotten at least the relevant ones. But some simple handy tricks are kept at a corner of memory.
We present 8 of those tricks which were indispensable then but which are equally relevant today:
1. How long till sunset – it is all in your fingers
You can predict the time remaining until sunset by this simple trick. Hold your fingers horizontally below the setting sun in such a way that the sun rests on the index finger and your hand sits on the horizon. Each finger indicates roughly 15 minutes till sunset.
2. A fistful of information -The days in each month
Make a fist and turn your hand so that the knuckles face you. Starting from the index finger, each knuckle and the gap in between represent different months. Start counting, and when you reach your baby finger, start again at the index. The knuckle represents 31 days and the gap indicates 30. The exception to the rule? The gap next to the first index finger represents 28 days unless it is a leap year.
3. What lies ahead – a new moon or a full moon
The alphabets O, D, and C can be used to determine whether the moon is waning or waxing. O represents the full moon; the moon is waning when it resembles the alphabet C. The moon shaped like a D is a waxing moon
4. Memory Aids
The first alphabets of a phrase can help us determine the value of each alphabet of the Roman Numerals. My Dear Cat Loves Xtra Vitamins Intensely. In descending order, the initial letters of each word denote a particular Roman numeral. The first alphabet M is 1000, D is 500, C is 100, L is 50, X is 10, V is 5 and I is 1.
5. Battery quality
Want to find out if a battery is a good one? Drop it from a height of around 2 cm. If it bounces and then falls, it is empty.
6. Fingers for multiplication
Multiplying small numbers is easy for children. But bigger single-digit numbers pose a problem. Teach the children a very simple trick. Open your palms facing towards you. Assign number 6 to 10 for every finger starting at the little one. Now connect the two fingers of both hands according to the number you want to multiply. For instance, to multiply 6 by 7, connect finger #6(the little finger) on the left palm with finger #7 (the ring finger) on your right. The 3 fingers below, including the ones connected, indicates tens. So, we have 30. Now. there are 4 fingers on the left hand and 3 on the right above of the touching fingers. Multiplying them gives us 12. Add the first number 30 to 12 and we have the answer, 42. Similarly, we can multiply any numbers between 6 and 8.
To multiply a number by 9, open your palms and place them, palms-down upon a table. Now they are numbered 1 to 10. To multiply the desired number, fold the numbered finger. The number before are tens, the numbers after are ones. So to multiply 8 by 9, fold finger number 8. The 7 fingers before, multiplied by 10 gives us 70. Adding 70 to 2, from the remaining two fingers, gives us the answer 72.
7. A lesson in length measurement
Measuring an object when you do not have a ruler is easy if you know this trick. The approximate distance between your forefinger and thumb measured at the tips is around 18 cm (7″) and between your thumb and your little finger around 20 cm (7.87″). This method is definitely not accurate because of the difference in the size of our hands. But if you know the distance between two fingers beforehand, it can be handy to measure large objects.
8. Degrees in your hands
Open up your palm to the maximum and place it on the surface which you want to measure. The little finger is taken as 0°. The angle it makes with the thumb is 90°. The angle between the little finger and the other fingers, starting with the ring finger are 30, 45 and 60 degrees approximately.