Find the sum of natural numbers between 20 and 100

Find the sum of all natural numbers between 1 and 100, which are divisible by 2 or 5

Find the sum of all natural numbers between 1 and 100, which are divisible by 3.

Find the sum of all natural numbers between 250 and 1000 which are exactly divisible by 3 .

Find the sum of all natural numbers between 1 and 145 which are divisible by 4.

(i) Find the sum of odd integers from 1to 2001. (ii) Find the sum of all natural numbers between 99 and 1001, which are multiples of 5.

Find the sum of all numbers between 10 and 100 that are divisible by 3.