HOW TO FIND UNIT DIGIT OF SQUARE
About "How to find unit digit of square"
How to find unit digit of square ?
Here we are going to see how to find unit digit of a squares.
To obtain square of a number, we have to multiply that number by itself, or multiply the same number two times.
Without doing actual multiplication, we may find the unit digit of the square of a number.For that, first we have to consider the unit digit of the given number.
Let us look into the example given below to understand the above concept.
Example 1 :
Write down the unit digit of the following number:
782
Solution :
782 = 78 ⋅ 78
To do actual multiplication, first we have to multiply the unit digit 8 and 8.
The unit digit of the product 8 and 8 will be the answer of unit digit of 782
So, we have 8 ⋅ 8 = 64
Here 4 is the unit digit of the product.
Hence 4 is the unit digit of the number 782.
Example 2 :
Write down the unit digit of the following number:
272
Solution :
272 = 27 ⋅ 27
To do actual multiplication, first we have to multiply the unit digit 7 and 7.
The unit digit of the product 7 and 7 will be unit digit of 272
So, we have 7 ⋅ 7 = 49
Here 9 is the unit digit of the product.
Hence 9 is the unit digit of the number 272.
Example 3 :
Write down the unit digit of the following number:
412
Solution :
412 = 41 ⋅ 41
To do actual multiplication, first we have to multiply the unit digit 1 and 1.
The unit digit of the product 1 and 1 will be the unit digit of 412
So, we have 1 ⋅ 1 = 1
Here 1 is the unit digit of the product.
Hence 1 is the unit digit of the number 412.
Example 5 :
Write down the unit digit of the following number:
352
Solution :
352 = 35 ⋅ 35
To do actual multiplication, first we have to multiply the unit digit 5 and 5.
The unit digit of the product 5 and 5 will be the unit digit of 352
So, we have 5 ⋅ 5 = 25
Here 5 is the unit digit of the product.
Hence 5 is the unit digit of the number 352.
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