What is the sum of all even numbers between 10 and 20?

Answer 1

To find the sum of all even numbers between 10 and 20, we first need to identify the even numbers in that range. The even numbers between 10 and 20 are 10, 12, 14, 16, and 18. Adding these numbers together, we get 10 + 12 + 14 + 16 + 18 = 70. Therefore, the sum of all even numbers between 10 and 20 is 70.

Answer 2

You can use a calculator to actually add them up.Or you can use the formula for the sum of an arithmetic sequence - this has the advantage that you can also use it for larger sequences (for example, all even numbers up to a thousand).

Answer 3

60, exclusive

90, inclusive