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What is a prime number between 60 and 80 that has consecutive sum?
There is no prime number between 60 and 80 that has a consecutive sum. The prime numbers between 60 and 80 are 61, 67, and 71, but none of them have consecutive sums.
What are all the square numbers and prime numbers that add up to a prime number?
There are an infinite number of square numbers and prime numbers whose sums are a prime number. Examples are 202 + 103 = 503, 22 + 13 = 17, 102 + 601 = 701, 22 + 163 = 167, 42 + 141 = 157, etc.
What is the secret number if it is greater than 25 and less than 50 and the tens digit is an odd number and the sums of the digits is less than 10?
The secret number must be a two-digit number greater than 25 and less than 50. Since the tens digit is odd, it can be 3, 5, or 7. However, the sum of the digits must be less than 10, so the only possible tens digit is 3. The units digit can be any number from 0 to 9 that, when added to 3, results in a sum less than 10. Therefore, the secret number is 31.
How are 181345913 and 11 relatively prime?
Two numbers are relatively prime (co-prime) if they have no common factor other than 1; that is their highest common factor (hcf) is 1. If one of the numbers is prime, then the two are relatively prime if the prime is not a factor of the other. 11 is a prime. If 11 divides into 181345913, then their hcf is 11 and the two are NOT relatively prime. If 11 does not divide into 181345913 then their hcf is 1 and they are co-prime. A simple test for divisibility by 11: Sum of digits in odd position: 1+1+4+9+3 = 18 Sum of digits in even position: 8+3+5+1 = 17 Difference between the two sums = 18-17 = 1 If this difference is divisible by 11 then so is the original number. The difference is not so 11 is not a factor of 181345913 and the two numbers are relatively prime.
How can you use turnaround facts to help you find sums?
Turnaround facts help you solve sums by encouraging you to start with the greater number first and add the lesser. ie. 5 + 1 = 6 is easier to solve than 1 + 5 = 6
Which is the only number which is equal to the sum of its digits?
Well, 1 is equal to 1. 9 is equal to 9. So any number from 0 to 9. I do not think this is what is meant by the question. If you mean any number with more than one digit. There is no such number. Because 11 sums to 2. 19 sums to 10. 21 sums to 3. 29 sums to 11. 111 sums 3. 119 sums to 11. The sums do not grow as fast the increase of digits.
What is the secret is prime number if it is greater than 25 and less than 50 and the tens digit is an odd number and the sums of the digits is less than 10?
The prime numbers between 25 and 50 are : 23 29 31 37 41 43 47However 2 and 4 (which appear in the tens place of 5 of these numbers) are not odd numbers.We are left with 31 and 37.The sum of digits of 37 is 10 which is not less than 10;but the sum of digits of 31 is 4 which is less than 10.So, 31 it is
What number is 2 times the sums of its digits?
1+8=9, 9x2=18 so 18 is one answer to this problem
What is the first year following 2011 in which the sums of the digits is 20?
2099
What is a prime number between 60 and 80 that has consecutive sum?
There is no prime number between 60 and 80 that has a consecutive sum. The prime numbers between 60 and 80 are 61, 67, and 71, but none of them have consecutive sums.
What is the test for divisibility of 11?
Split the number into its alternate digits.Sum the digits in each setIf the difference between their sums is zero (0) or divisible by 11 then the original number is divisible by 11.ExamplesIs 1289324 divisible by 11?Split into alternate digits: 1_8_3_4 and _2_9_2 Sum each set of digits:1_8_3_4 -> 1+8+3+4 = 16_2_9_2 -> 2+9+2 = 13Difference between the sums: 16 - 13 = 3, not divisible by 11; so original number 1289324 is not divisible by 11.Is 19407278 divisible by 11?Split into alternate digits: 1_4_7_7 and _9_8_2_6 Sum each set of digits:1_4_7_7 -> 1+4+7+7 = 19_9_0_2_8 -> 9+0+2+8 = 19Difference between the sums: 19 - 19 = 0; so original number 19407278 is divisible by 11.
What are all the square numbers and prime numbers that add up to a prime number?
There are an infinite number of square numbers and prime numbers whose sums are a prime number. Examples are 202 + 103 = 503, 22 + 13 = 17, 102 + 601 = 701, 22 + 163 = 167, 42 + 141 = 157, etc.
What is the secret number if it is greater than 25 and less than 50 and the tens digit is an odd number and the sums of the digits is less than 10?
The secret number must be a two-digit number greater than 25 and less than 50. Since the tens digit is odd, it can be 3, 5, or 7. However, the sum of the digits must be less than 10, so the only possible tens digit is 3. The units digit can be any number from 0 to 9 that, when added to 3, results in a sum less than 10. Therefore, the secret number is 31.
What are the sums of the first prime numbers?
2 + 3 = 5
How many sums are greater than 600?
Infinitely many.
Is 8426 divisible by 11?
Yes. Sum of the digits in the odd positions = 8 + 2 = 10 Sum of the digits in the even positions = 4 + 6 = 10 The difference of these sums = 10 - 10 = 0 Since this number leaves a remainder of 0 when divided by 11, the original number is divisible by 11.
How are 181345913 and 11 relatively prime?
Two numbers are relatively prime (co-prime) if they have no common factor other than 1; that is their highest common factor (hcf) is 1. If one of the numbers is prime, then the two are relatively prime if the prime is not a factor of the other. 11 is a prime. If 11 divides into 181345913, then their hcf is 11 and the two are NOT relatively prime. If 11 does not divide into 181345913 then their hcf is 1 and they are co-prime. A simple test for divisibility by 11: Sum of digits in odd position: 1+1+4+9+3 = 18 Sum of digits in even position: 8+3+5+1 = 17 Difference between the two sums = 18-17 = 1 If this difference is divisible by 11 then so is the original number. The difference is not so 11 is not a factor of 181345913 and the two numbers are relatively prime.
