This is a neat trick that you can use to really puzzle your friends and family. If someone gives you a three-digit number, you can actually figure out what the end result will be after you’ve received two additional numbers, but before you actually know what those numbers are. Does this sound confusing? Watch the video and I’ll show you how it works.
Download Student Worksheet & Exercises
Were you able to figure this problem out? The real trick is that you’re simply adding 1,998 to the first number that you received. No matter which other two numbers are given to you, make sure the number you write down makes each pair of numbers’ sum 999. If you do this correctly twice, then the row of numbers you add together will be the same as the initial number plus 1,998. Try it out and let me know if it works for you!
Exercises
Predict the end result for the following numbers:
- 235
- 988
- 002
- 999
- 427
- 777
- 559
- What would be the difference between a number 769 and its predicted result based on the above knowledge?
- A mathematician was given a number x and gave its end result as 2877. What is the value of x?
- Suzanne was asked by her friend to predict the end results of 932 within a few seconds. If she was given 432 as one of the two additional numbers to complete the proof of the predicted number, which number did she write immediately afterwards?