Unit digit of the square of 426

Here we will show you two ways of finding the unit digit of the square of 426. First, we will define what the unit digit of the square of 426 means. Next, we will find the unit digit of the square of 426 using the Rule Method, and then we will find the unit digit of the square of 426 using the Math Method.

The last digit (one digit) of the product you get when you multiply 426 by itself is the unit digit of the square of 426.

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 426 depends on 6, because that is the last digit in 426. 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 426 is 6, therefore Rule E applies, and the unit digit of the square of 426 is 6.

Unit digit of the square of 426 = 6

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 426 is 6, so you multiply 6 by itself, and then look at the unit digit to get the answer once again:

6 × 6 = 36
Unit digit of 36 is 6.
Unit digit of the square of 426 = 6

Of course, instead of using either of the methods above, you can multiply 426 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 426. We did that below to double-check that our answer is correct:

426 × 426 = 181476
Unit digit of 181476 is 6.
Unit digit of the square of 426 = 6

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