Keep reading and re discover these incredible tricks that will be of great help.

-Know the number of days of each month

With the closed fist counts the months by the knuckles. Each knuckle and each cleft between them represents a month. If the month falls on knuckle has 31 days, if it falls into a cleft has 30 or less.

-Determine the time before sunset

Put your fingers together and stretch your hand so that the sun is on your index finger. Count the number of fingers to the horizon; each finger represents an approximate 15 minutes for the sunset.

-Waxing crescent moon?

To know in which phase the moon compares it with the letters D, C, and O. Moon D is increasing, O is full Moon and C is waning.

-Nemotechnique to learn Roman numerals

Use the following phrase: LaCa De Mamá. The letters L, C, D, M represent the numbers 50, 100, 150, and 200 respectively.

-Check the charge of a battery

Raise the battery to one or two centimeters on a table and let it fall; if it staggers and falls it has no load.

-The Nine Table with Hands

Put your hands with your palms towards you. Assign to each finger of the left hand a number, from 1 to 5, starting with the little finger; and from 6 to 10 to each finger of the right hand starting with the thumb. Now, to multiply, for example, 9 × 7, lower the assigned finger with the number 7; the number of fingers remaining to the left of that finger will be tens, and the number of fingers to the right units. In the example, 9 × 7 = 63.

-How to know the degrees of an angle?

Extend your fingers as far as you can and place the palm on a flat surface. The pinky should be at the bottom and represents 0; the thumb represents 90 °, the index 60 °, the medium 45 ° and in the annulus 30 °

-Notes on the staff

To remember the location of the notes memorize the following sentences. For notes on the lines: MY SUN IS ALWAYS REPEAT FAULUS. For notes in the spaces between the lines: FAbrica LA DOrada MIel.

-The order of the planets

It is enough to remember the following phrase and use it as a mnemonic resource: “My Old Aunt Marta Never Knew Nothing to the Bread”; Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune and Pluto.