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Most credit and debit cards have sixteen digits. American Express cards have fifteen. Even fifteen digits is enough to allow every single person on Earth to have over a thousand credit cards, which is why it's unlikely that a random string of digits will turn out to be a valid credit card number.
The average person has six digits.
145 pounds is 65.77 kilograms.
between 50 kilograms to 500 kilograms
Multiply the weight in pounds by 0.453 to get kilograms.
Significant figures or significant digits is a system for keeping track of the precision of a calculation. For example, if I have 1/3 of a pizza, and I need to divide that pizza between 4 people, I'd need 1/12 of the pizza for each person. However, sometimes we have to round our answers (e.g. when entering the values in a calculator or computer). Using the above example, if we used 0.33 for 1/3 and 0.25 for 1/4, then we have two decimal places of precision, or two significant digits after the decimal place. Multiplying those two values gives 0.0825. Since we know only two of our digits in each of the multiplying numbers were accurate, we can only assume that two of the digits in the answer is correct. As an illustration, consider that 1/12 is really 0.0833333... As you can see in this case, the first two digits (0.08) are correct, and the subsequent digits are incorrect.
The person's mass on the moon is still 60 kilograms. Their weight would be about 10 kg.
165 pounds equates to 74.8 (74.8427) kilograms.
To convert from US pounds to kilograms, multiply by 0.454.
Extra digits, fingers or toes
The weight of one gram is about the same as a paperclip. So unless this person is extremely tiny, the answer would be 100 kilograms. To give you a reference, 100 kilograms is about 220 pounds.
Use a metric scale.