# What is a two digit prime number whose digits add up to 5?

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it is 23 because 2+3 = 5
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23 or 41

32

it is 23

# What 2-digit prime number has a sum of 10 when you add up its digits?

Two-digit prime numbers whose digits add up to 10 are: 19 37 73

# What are the two digit multiple of 8 whose digit add up to 10?

64 is a two digit multiple of 8 (8x8) and if you add 6 and 4 together you get 10

# A three digit number whose digits add up to 9?

900, 810, 801, 720, 711, 702, 630, 621, 612, 603, 540, 531, 522, 513, 504, 450, 441, 432, 423, 414, 405, 360, 351, 342, 333, 324, 315, 306, 270, 261, 252, 243, 234, 225, 216,

# A three digit number whose digits add up to 900?

Three digits can't possibly add up to 900. The largest possible sum of 3 digits is (9 + 9 + 9) = 27.

17

# Why do no digits of a prime number add up to 9?

Because they're in multiples of three - a quick way to tell if a number is a multiple of three is to add up the digits and see if the digits add up to a multiple of three e.g

67

67

# What are all the two digit prime numbers neither of whose digits are prime?

11, 19, 41, 61, and 89

# What is the largest and smallest of two-digit prime numbers whose digits are also prime digits themseleves?

Smallest is 11 & Largest is 77.