The 1089 Math Magic

Here is a little trick.

1.) Write a 3-digit number whose digits is decreasing. For example, 421.

2.) Next, reverse the order. The new number now is 124.

3.) Subtract the original number from the reversed number.
421 – 124 = 297

4.) Add the answer in (3) to the reverse of itself.
297 + 792 = 1089.

Let’s try another example.

First step, let’s choose 843.

Next, we reverse its digits: 348.

We subtract: 843 – 348 = 495. 

Next, we add 495 to the reverse of itself which is 594.

495 + 594 = 1089.

Let’s try one more example.

First step, let’s choose 762.

Next, we reverse its digits: 267.

We subtract: 762 – 267 = 495

Therefore, 495 + 594 = 1089.

2 thoughts on “The 1089 Math Magic

  1. Pingback: The Idea Behind the 1089 Math Trick

  2. Pingback: 2015 Year in Review - Second Quarter - Math Tricks for Kids

Leave a Reply

Your email address will not be published. Required fields are marked *