B. SUMthing to Do Directions:
Solve the following in a separate sheet of paper.

1. Find the sum of the first 150 counting numbers.

2. Find the sum of the first 50 odd natural numbers.

3. Find the sum of the first 42 terms of arithmetic sequence 5, 8, 11, 14, 17, ...,

4. How many numbers between 25 and 400 are multiples of 11? Find their sum.

5. Find the sum of all positive integers between 29 and 210 that are divisible by 4. ​