Unit digit of the square of 12370

Here we will show you two ways of finding the unit digit of the square of 12370. First, we will define what the unit digit of the square of 12370 means. Next, we will find the unit digit of the square of 12370 using the Rule Method, and then we will find the unit digit of the square of 12370 using the Math Method.

The last digit (one digit) of the product you get when you multiply 12370 by itself is the unit digit of the square of 12370.

Rule Method
The unit digit of any square will never be 2, 3, 7, or 8. It can be only 0, 1, 4, 5, 6, or 9. Furthermore, the unit digit of the square of a number depends on its units digit. In other words, the unit digit of the square of 12370 depends on 0, because that is the last digit in 12370. Here are the rules:

Rule A) If the unit digit of a number is 0, then the unit digit of the square of that number is 0.

Rule B) If the unit digit of a number is 1 or 9, then the unit digit of the square of that number is 1.

Rule C) If the unit digit of a number is 2 or 8, then the unit digit of the square of that number is 4.

Rule D) If the unit digit of a number is 5, then the unit digit of the square of that number is 5.

Rule E) If the unit digit of a number is 4 or 6, then the unit digit of the square of that number is 6.

Rule F) If the unit digit of a number is 3 or 7, then the unit digit of the square of that number is 9.

The unit digit of 12370 is 0, therefore Rule A applies, and the unit digit of the square of 12370 is 0.

Unit digit of the square of 12370 = 0

Math Method
The unit digit of the square of a number depends on its units digit with this method too. Here you multiply the unit digit of the number by itself, and then look at the unit digit of that product. Again, the unit digit of 12370 is 0, so you multiply 0 by itself, and then look at the unit digit to get the answer once again:

0 × 0 = 0
Unit digit of 0 is 0.
Unit digit of the square of 12370 = 0

Of course, instead of using either of the methods above, you can multiply 12370 by itself if you have the time or a calculator, and then identify the unit digit to get the answer to the unit digit of the square of 12370. We did that below to double-check that our answer is correct:

12370 × 12370 = 153016900
Unit digit of 153016900 is 0.
Unit digit of the square of 12370 = 0

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