This is a trick I did not discover until my college years and I believe that it is something that students of all ages who understand the material should be working on until it becomes a mastered skill. I decided to re-create it for my tech task #3.

It works with any number, you just round up to the highest facator of ten (100, 1000…). To the best of my knowledge it works with all numbers if done correctly, although sometimes it’s counter-productive to use if the numbers are far away from the base of ten (585 x 427) or the numbers are large.

Is there a certain range of numbers this strategy works for? If the numbers are smaller this would not be as smooth but would it still work?

It works with any number, you just round up to the highest facator of ten (100, 1000…). To the best of my knowledge it works with all numbers if done correctly, although sometimes it’s counter-productive to use if the numbers are far away from the base of ten (585 x 427) or the numbers are large.

This is awesome Matthew, I wish I would have found out about this when I was younger, would have been super helpful!