Converting from 51 kilograms to pounds can be solved as a simple unit conversion problem, so long as you know what the conversion factor between pounds and kilograms is. There are 2.2046 pounds for every kilogram and .454 kilograms for every pound. These can be written as fractions: 2.2046 lbs/1 kg (also, 1 kg/2.2046 lbs) or 1 lb/.454 kg (also, .454 kg/1 lb).
- Set up the problem
Write the problem out, starting with the known information and followed by the conversion factor as a fraction. Ensure the unit you want to convert to is in the numerator of the fraction. It should look like this: 51 kg x 2.2046 lbs/1 kg.
- Cancel the common factors
In this case, the common factor is the unit, kilograms. The unit can be cancelled because one is in the numerator and the other is in the denominator of two different fractions being multiplied together. The result looks like this: 51 x 2.2056 lbs/1.
- Solve the problem
Multiply 51 by 2.2046 and arrive at your result. Be sure to include the unit, lbs, with your numerical answer.