How many numbers upto 400 are divisible by both 3 and 7?

Therefore 19 numbers are divisible by both 3 and 7 up to 400.

How many numbers are divisible by both 3 and 7?

common number is 21, so number of numbers which are divisible by both 3 and 7 are 10.

How many numbers from 1 to 400 are divisible by both 3 and 5 but not by 30?

This means we have to count all the numbers which are either divisible by 3 or by 5 or by both. hence 133 numbers are divisible by 3 between 1 and 400. 5, 10, 15, ………., 395 are the numbers which are divisible by 5. hence 79 number are divisible by 5 between 1 and 400.

How many numbers between 1 and 400 both included are not divisible either by 3 or 5?

Hence the answer is 186.

How do you know a number is divisible by?

A number is divisible by 2 if its last digit is 2, 4, 6, 8 or 0 (the number is then called even) A number is divisible by 3 if ist sum of digits is divisible by 3. A number is divisible by 4 if the number consisting of its last two digits is divisible by 4. A number is divisible by 5 if its last digit is a 5 or a 0.

What can I multiply to get 400?

List of Factor Pairs for 400

• 1 x 400 = 400.
• 2 x 200 = 400.
• 5 x 80 = 400.
• 8 x 50 = 400.
• 10 x 40 = 400.
• 16 x 25 = 400.
• 20 x 20 = 400.
• 25 x 16 = 400.

How many numbers between 1 and 400 are divisible by 3?

We have to calculate the numbers between 1 and 400 which are divisible by 3 or 5. This means we have to count all the numbers which are either divisible by 3 or by 5 or by both. hence 133 numbers are divisible by 3 between 1 and 400.

How many even numbers will be divisible by 2?

I stumbled upon the following in a book: till 400 all even numbers will be divisible by 2 ( 200 even numbers) remaining 200 odd numbers 1 3 5 7 9 ….. 399 200/3 = 67 will be divisible by 3… Stack Exchange Network

What is the number that is divisible by 3 and 7?

3 and 7 are relatively prime, that is don’t have any common factors. So, for a number to be divisible by both 3 and 7, it should be a multiple of 3 and 7, the smallest such number would be 21. Now, all multiples of 21 like 21, 42, 63, 84, 105,… that are less than 400 would be divisible by 3 and 7. There would be 400/21 = 19 such numbers.

Which numbers between 1 and 20 are divisible by 3 and 5?

Lets understand it by taking a smaller range, say we have to find numbers between 1 and 20 (both included) which are divisible either by 3 or by 5, the number 15, which is the LCM of 3 and 5, is in both the list, i.e., it is divisible by both 3 as well as 5 so we have to count it only once,