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Q: How many significant digits are in the number 129?

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Number of neutrons = Mass number - Atomic number = 129 - 53 = 76

Yes. 1 + 2 + 9 = 12 12 is divisible by 3. If the sum of the digits of a number are divisible by 3, then the whole number is divisible by 3. 129 is a composite number because it divisible by a factor other than 1 and itself.

You can tell a number is divisible by 3 when the sum of its digits is equal to 3 or a multiple of three. In this instance, 1 + 2 + 9 = 12/3 = 4, therefore 129 is divisible by 3.

129+1

129 is a Composite Number.

The are a number of mathematical operations that gives us the number 129. When you add 100 to 29 you will get 129. Similarly when you subtract 11 from 140, you will get 129.

1, 3, 43, 129.

129 is divisible by three, hence it is a composite number.

The number 129 is translated into Spanish as "ciento veintinueve".

129 = 3 x 43

115 + 14 = 129

Exactly as it is because 129 is an integer or a whole number

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