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

# 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, …207, 180, 171, 162, 153, 144, 135, 126, 117 and 108. NOTE : These numbers have digits whose sum is 9. An interesting mathematical fact is that they are also all divisible by 9. This applies to any number. If the sum of the digits = 9 or a multiple of 9 then the number is divisible by 9.

# 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.

# Is there a two digitmultiple of 5 whose digits add up to 13?

the answer is 85

# 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 …576, 5+7+6=18, 1+8=9, 9 is a multiple of three

# What prime two digit numbers are multiples of 5?

there aren't any as otherwise they wouldn't be prime numbers

Answered

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

11, 19, 41, 61, and 89

Answered

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

Smallest is 11 & Largest is 77.

Answered

# What is largest two digit prime numbers whose digits are also prime?

73 satisfies your condition.