How many even number are there between 10 and 20?

(c) 15. (d) 16. Hint: First of all find the even and odd numbers lying between 10 and 20. Even numbers between 10 and 20 are 12, 14, 16, 18 and odd numbers between 10 and 20 are 11, 13, 15, 17, 19.

What is the sum of consecutive numbers 1 20?

By using the formula :sum of first n numbers is equal to n(n+1)/2. So the sum of the numbers from 1 to 20 is 210. We will check this manually, 1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20= 210.

What is the sum of all numbers between 1 and 10?

55
There are a total of 10 natural numbers in the list from 1 to 10. The sum of the first ten natural numbers, that is from 1 to 10 is 55.

What are the numbers between 10 to 20?

Answer and Explanation: There are seven composite numbers between 10 and 20. These are 10, 12, 14, 15, 16, 18, and 20.

What is the sum of the first 10 even numbers?

110
Therefore, the first 10 even natural numbers will be 2, 4, 6, 8, 10, 12, 14, 16, 18 and 20. Hence, the required sum of the first 10 even natural numbers is 110.

What is the sum of the numbers from 11 to 20?

The sum of the consecutive number from 11 to 20 is 155.

What numbers can be written as the sum of two consecutive numbers?

In the above, 9 and 15 were the only numbers that I could find that could be written in more than one way. Many people spotted the pattern that all odd numbers (except 1) could be written as the sum of two consecutive numbers.

How do you find the sum of 3 consecutive odd numbers?

It’s the same as the rule for 3 consecutive numbers. Take a number and divide it by 5, call it n, and then your number is the sum of (n-2), (n-1), n, (n+1) and (n+2). We then made a conjecture that since it is true for 3 and 5, it would also work for 7, 9 and any other odd number.

What are the two consecutive natural numbers that are prime?

And only two consecutive natural numbers which are prime are 2 and 3. Apart from those, every prime number can be written in the form of 6n + 1 or 6n – 1 (except the multiples of prime numbers, i.e. 2, 3, 5, 7, 11), where n is a natural number.

How many integers are there from 20 to 27?

We know there are a total of 8 numbers from 20-27. In this example, we can count by looking at the diagram, but we can also find the total number of integers by subtracting the smallest number from the largest number and adding 1. The smallest number is 20, and the largest number is 27.