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The smallest Prime number, of course, is 2.

The smallest prime number whose digits add up to 2 is, of course, 2.

The next-smallest is 11.

It is left as an exercise for the reader to determine whether the other numbers whose digits add up to 2 (e.g. 101, 1001, 10001) are prime.

Q: What is the prime number that its digits adds up to the smallest prime number?

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Assuming that "adds up to" means "its digits add up to" 888

Composite. 222111 has 9 as one of its factors [sum of its digits adds up to 9]. A Prime Number has only two factors : 1 and itself. Since this has at least one additional factor, it is composite.

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The number 4 is one more than the number 5. Number 5 includes the first 4 digits, but adds 1 to them.

3 is a Prime number, which means it can only be multiplied by itself or by 1. 1x3 =3, or 3x1 is 3. The number 3 adds to be 6 twice; 2 x 3 = 6.

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Assuming that "adds up to" means "its digits add up to" 888

199 and 11

Composite. 222111 has 9 as one of its factors [sum of its digits adds up to 9]. A Prime Number has only two factors : 1 and itself. Since this has at least one additional factor, it is composite.

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The number 4 is one more than the number 5. Number 5 includes the first 4 digits, but adds 1 to them.

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Solution: Given, number = 0.4559 If a number only has 2 significant digits, the maximum significant digits it can be rounded to is 2 significant digits. The zeros before a non Zero digit are not significant. The since 9>5 it adds 1 to preceding one while rounding off. ⟹0.046. The original number, 0.4559, has 4 significant digits. Rounding this number to 2 significant digits gives us 0.46.

3 is a Prime number, which means it can only be multiplied by itself or by 1. 1x3 =3, or 3x1 is 3. The number 3 adds to be 6 twice; 2 x 3 = 6.

3 is a prime number, which means it can only be multiplied by itself or by 1. 1x3 =3, or 3x1 is 3. The number 3 adds to be 6 twice; 2 x 3 = 6.

A number can be divided by 3 if it's digits adds up to 3, 6 or 9. E.g. 63 or 279 (because 2+7=9 and 9=9)

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