First take the weight in pounds and multiply by 453.59. The resulting number is the weight in grams. To convert grams to kilograms, simply divide by 1000. Or, an easier option is to take the weight given in pounds and multiply by 0.45359. In this case the answer is 8.16 kilograms.
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18 pounds is how many kilograms?
Here are some unit conversion equalities that you should memorize.
454 grams = 1 lb. Mass
2.54 cm = 1 inch Length
946 ml = 1 qt. Volume
18 lb * 454 g/lb. * 1 Kg / 1000 g = ______lb.
Notice I inverted the mass conversion equality, other wise the units would not cancel.
(18 * 454 ) ÷ 1000 = ______.
Notice in this method the units cancel.
lb/lb g/g only Kg is left.
I prefer this method because if the units do not cancel, I have done something wrong. I have divided when I should have multiplied.
For example If I go in reverse:
10 Kg * 1000g/ Kg * 454 g/lb = I do not get lb.
Notice the grams do not cancel
10 Kg * 1000g/ Kg * 1 lb/454g = _____ lb.
The Kg and g does cancel and you end up with lb
18 pounds is equal to approximately 8.165 kilograms.
18 kg is approximately equal to 39.68 pounds.
18 kg = 18 000 gTo convert from kg to g, multiply by 1000.
There are approximately 8.16 kilograms in 18 pounds.
18 pounds = 8.16 kilograms.