Some common tricks are so useful and simple they can come in handy to more than one generation. However, over time, they’re somehow forgotten, and they turn into what’s called "grandma’s tips."

We decided to recall the past and collected eight great tricks from childhood, which everyone forgot.

TIMESTAMPS

Determine the time left before sunset 0:31

Know if the moon is waxing or waning 0:57

Know the degrees of an angle 1:22

Memory trick 1:53

Check battery quality 2:24

Multiplication on fingers 2:42

Length 4:11

Know the number of days in a month 4:55

#mathgames #mathtricks

SUMMARY

Keep your fingers together, and reach your hand out so that the sun "lies" on your index finger. Now count the number of fingers on the horizon line. Each of the fingers represents approximately 15 minutes until sunset.

To determine the moon phase easily, use the shape of the letters D, O, and C. The full moon is O, the first quarter is D, and the third is C.

In other words, the letter ‘C’ will mean ‘waning,' and the letter D – ‘waxing.'

Spread your fingers as much as possible, and put your palm on a surface, the angle of which you want to measure. The little finger should lie on the bottom side: 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°.

Make a fist, and start counting the months by knuckles. Each knuckle bump and gap is a separate month. If you count on one hand, then, after reaching the end, start again with the knuckles of the index finger. Let’s see: January, February, March, April, May, June, July.

Now, the right hand: August, September, October, November, and December.

If the month is on the knuckle bump, there are 31 days. If it’s on the gap — 30 or less.

If you need to measure an object approximately but there’s no ruler at hand, you can use the fingers of one hand.

By the average human proportions, the distance between the tips of the thumb and forefinger is about 7 inches (18 cm), and the distance between the thumb and little finger is about 7.87 inches (20 cm).

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