Oh, dude, let me break it down for you. So, first, you find how many numbers are divisible by 6, which is 166. Then you find how many are divisible by 21, which is 47. But wait, don't forget to subtract the ones divisible by both 6 and 21, which is 7. So, the total is 166 + 47 - 7 = 206 integers that fit the bill. Easy peasy!
The total number of prime numbers less than 100 is 25.
To find the average of a given set of numbers, total the numbers and divide that total by the number of members of the set.
Add up the digits. If the total is a multiple of 9, the whole number is a multiple of 9.
Another number added to a number is the sum (total) of the two numbers.
There are 22 such numbers.
The rule for deciding if a number is divisible by 3 is to add up the digits of the number. If that total is a multiple of 3, the original number is as well. This applies to numbers of any length.
Let's assume, or hope, that the blank is after those numbers. 67_ and 45_ For a number to be divisible by three, the total of the number's digits has to be divisible by three. 672 and 450
All numbers that are divisible by 6 are even numbers whose digits add up to 3 or a multiple of 3. Example : 284 is not wholly divisible by 6 as although it is even, its digits total 2 + 8 + 4 = 14 which is not divisible by 3. 282 is divisible by 6 as it is even and its digits total 12 which is divisible by 3.
There are a total of 14 numbers between 0 & 100 that are divisible by 7.
No. (A short cut to check if a number is divisible by 3. Add all the numbers and if the total divides by 3, then the number will divide by 3. eg 1+6+4 =11, which is not divisible by 3 therefore 164 is not divisible by 3)
Any multiple of 9. In other words, any number of the form 9 * n. Add the digits of the number. If that total is divisible by nine, so is the original number. Example: 12,345,678. The digits total 36. 36 is divisible by 9. So is 12,345,678.
The total number of integers between 100 and 300 that are divisible by three is 66.
33 divisible by 3. 14 divisible by 7. 4 divisible by both. Total: 43
all digits in the number must total to a number divisible by 3 when added up e.g 156=1+5+6=12 which is divisible by 3 you can proove this using other numbers eg 39,24,1107 e.t.c
All numbers divisible by 5 (of which 15 is a multiple) have a final digit of 0 or 5. All numbers divisible by 3 (of which 15 is a multiple) have the sum of the digits totalling 3 or a multiple of 3. Therefore, a number is divisible by 15 if the sum of its digits total 3 or a multiple of 3 and its final digit is 0 or 5. Example : 32085 ; 3 + 2 + 0 + 8 + 5 = 18 which is divisible by 3. Final digit 5. This number is divisible by 15. (32085 ÷ 15 = 2139) 7420 : 7 + 4 + 2 + 0 = 13. This number is not divisible by 15.
No.