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What two digit number is 7 times the sum of its digits?
21
Explain why 21 is not a prime number?
21 has factors other than 1 and itself, so it is not a prime number. For example, it is divisible by 3. (You can check this by adding the digits of the number: 2 + 1 = 3. If the sum of the digits is divisible by 3, the number is also divisible by 3.) Therefore, 21 is a composite number.
Name a number who's sum of digits less than 4?
21
What is the smallest prime number where each of the digits is a prime number 23 13 21 17?
13
How do you find out if a number is multiple of 4?
If last two digits of a number are divisible by 4 then number is a multiple of 4 for a number with more than 21 digit
What is the smallest whole number where the sum of the digits is 21?
It is 399.
What is the smallest whole number that is equal to seven times the sum of its digits?
21
Between 70 and 80 the product of its digits is 21?
Try the different numbers - there are only 11 after all - and multiply their digits. Or analyze the factors of the number 21.
What two digit number is 7 times the sum of its digits?
21
Explain why 21 is not a prime number?
21 has factors other than 1 and itself, so it is not a prime number. For example, it is divisible by 3. (You can check this by adding the digits of the number: 2 + 1 = 3. If the sum of the digits is divisible by 3, the number is also divisible by 3.) Therefore, 21 is a composite number.
Find a two-digit number whose value is increased by 75 percent when its digits are reversed?
The number you are looking for is 12. Reversing the digits gives you 21 75% of 12 is 9 12 + 9 = 21
Name a number who's sum of digits less than 4?
21
2 digit prime number less than 47. The product of my digits is 21?
The answer to your question is.... 37! Qualifications: -2 - digit number -less than 47 -product of digits is 21 The number 37 meets all of these requirements. 🌟
What number am I I am a multiple of 7 and a factor of 210. The product of my two digits is odd. What number am I?
21 or 35
What is the smallest prime number where each of the digits is a prime number 23 13 21 17?
13
How many digits are in 30 pages that begin with one and there is one whole number in each page?
There are 9 pages with a single digit (pages 1-9) = 9 digits There are 30 - 9 = 21 pages with two digits = 21 × 2 = 42 digits → There are 9 + 41 = 51 digits in total.
What are the first 21 digits of pi including the whole number and 20 places after the decimal?
3.14159265358979323846
