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How many prime numbers up to 100 have the number 9 as their units digit?
Wiki User
∙ 9y ago
19 29 59 79 89
Five of them.
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∙ 9y ago
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what is less than 100 with a 1 in the units place are prime number?
2, 3, 5, and 7 are prime numbers for one digit numbers. 1 is NOT a prime number.
How many two digit prime numbers are there between 1-100 such that they have digit 7 in their units place?
There are 5 of them.
How many of the integers from 1 to 121 that have a units digit of 1 are prime?
The prime numbers with a units digit of 1 in the range 1 - 121 are :- 11, 31, 41, 61, 71 and 101.......making 6 primes in total.
How many 3 digit numbers can you make using the numbers 1 2 3 and 4. if the hundred digit is a prime number and repetition of a digit is not permitted?
From {1, 2, 3, 4} there are two prime numbers (2, 3} which can go in the hundreds position, which once chosen allows 3 possible choices for the tens digit and a further 2 possible choices for the units digit, giving 2 x 3 x 2 = 12 possible numbers.
The largest known prime number is equal to how many inches?
Prime numbers are pure numbers, without units or dimensions.
what is less than 100 with a 1 in the units place are prime number?
2, 3, 5, and 7 are prime numbers for one digit numbers. 1 is NOT a prime number.
How many two digit prime numbers have a units digit of 7 and what are the prime numbers?
17, 37, 47, 67, 97
Do all 2 digit prime numbers have a units number of 1 3 7 or 9?
Yes
Two prime numbers between 100 and 199 such that the tens digit is a prime number and the tens and ones digit taken together are a 2 digit prime number find the sum of these two prime numbers?
For the tens digit to be a prime number then it must equal 2, 3, 5 or 7. There are four 3-digit prime numbers that fit the above condition and also have the tens and units digits forming a 2-digit prime number. 131, 137, 173, 179. The person supplying the question may like to sum the various combinations.
What is the units digit of the product of the first 100 prime numbers?
0 Look at the product of the first 3 prime numbers: 2 x 3 x 5 = 30. Any number multiplied by 30 will have a 0 in the units digit. So, no matter how many prime numbers you are multiplying, if once you have a number ending in 0, all of the rest will end in 0.
How many two digit prime numbers are there between 1-100 such that they have digit 7 in their units place?
There are 5 of them.
What is the digit in the units place of a number is 5 if the no lies between 150 and 200 will be composite or prime?
For any integer greater than 5, where the units digit is 5 then that number can be expressed as the product of n and 5. As such, the number is composite. Therefore all numbers in the range 150 to 200 that have a units digit of 5 are composite,.
How many two-digit primes are there whose units digit is less than its ten digits?
There is no simple formula for that; I suggest you look up the prime numbers in a table of prime numbers, analyzing each prime number in the range 10-99 whether it fulfills this specific criterion.
The units digit of a two digit number exceeds twice the tens digit by 1 what numbers if the sum of its digit is 10?
The units digit of a two digit number exceeds twice the tens digit by 1. Find the number if the sum of its digits is 10.
Your hundreds and tens digits are prime numbers whose sum is 12 and product is 35 your units digit is one less than your tens digit your date is an even number what are you?
754 Piece of cake!
The ones digit of a three digit prime number is never which number 3 5 7 9?
Except for 5 itself, the units digit of a prime can't be 5. Any number ending in 5 is divisible by 5.
How many of the integers from 1 to 121 that have a units digit of 1 are prime?
The prime numbers with a units digit of 1 in the range 1 - 121 are :- 11, 31, 41, 61, 71 and 101.......making 6 primes in total.
