Addition is ⁣the action or process of adding something to something else.

⁣A ratio is an ordered pair of numbers a and b, written a / b where b does not equal 0. A proportion is an equation in which two ratios are set equal to each other. For example, if there is 1 boy and 3 girls you could write the ratio as: 1 : 3 (for every one boy there are 3 girls)

⁣To determine the percentage, we have to divide the value by the total value and then multiply the resultant by 100.

⁣Our solar system consists of our star, the Sun, and everything bound to it by gravity – the planets Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune; dwarf planets such as Pluto; dozens of moons; and millions of asteroids, comets, and meteoroids.

⁣A conversion factor is an expression for the relationship between units that is used to change the units of a measured quantity without changing the value.

⁣Adding numbers for children