Unit digit of the square of 25008

Here we will show you two ways of finding the unit digit of the square of 25008. First, we will define what the unit digit of the square of 25008 means. Next, we will find the unit digit of the square of 25008 using the Rule Method, and then we will find the unit digit of the square of 25008 using the Math Method.

The last digit (one digit) of the product you get when you multiply 25008 by itself is the unit digit of the square of 25008.

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 25008 depends on 8, because that is the last digit in 25008. 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 25008 is 8, therefore Rule C applies, and the unit digit of the square of 25008 is 4.

Unit digit of the square of 25008 = 4

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 25008 is 8, so you multiply 8 by itself, and then look at the unit digit to get the answer once again:

8 × 8 = 64
Unit digit of 64 is 4.
Unit digit of the square of 25008 = 4

Of course, instead of using either of the methods above, you can multiply 25008 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 25008. We did that below to double-check that our answer is correct:

25008 × 25008 = 625400064
Unit digit of 625400064 is 4.
Unit digit of the square of 25008 = 4

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