Have you ever had to add a series of sequential numbers? For example, if you need to add the numbers 1 through 10. Can you do it? Can you do it without adding 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9?
Let's solve this one with today's tip.
Step 1: Add the first and last number in the sequence. 1 + 9 = 10.
Step 2: Divide that total of Step 1 by 2. 10/2 = 5.
Step 3: Multiply the answer in Step 2 times the number of numbers in the sequence. In this example, it is 9. 9 x 5 = 45.
You solved it! The total of 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 = 45.
Here's another one to try.
What is the total of the sequence of numbers from 10 to 14?
Step 1: Add the first and last number in the sequence. 10 + 14 = 24.
Step 2: Divide the total of Step 1 by 2. 24/2 = 12.
Step 3: Multiply the answer in Step 2 times the number of number in the sequence. 12 x 5 = 60.
You're right! The total of 10 + 11 + 12 + 13+ 14 = 60!
This practical tip works every time, and will simplify your life, especially if you have a long list of sequential numbers to add. Try it, and share this with a friend!
No comments:
Post a Comment