Square of a Number

Square of a number having 5 at its one’s place and 2 or more digits at its ten's, hundred's,......etc. place is equal to 25 followed by the product of the number of the remaining digits and the number exceeded by 1.

Square of a Number
Square of a Number


You may write the products in one line.



a)         5 5         (b)         6 5         (c)         7 5         (d)         1 0 5

         x 5 5                    x 6 5                    x 7 5                   x 1 0 5

      ______                 ______                 ______                 _______



           (e)         2 0 5         (f)         3 4 5         (g)         9 9 5

                     x 2 0 5                    x 3 4 5                   x 9 9 5

                 ________                  ________               ________


Check answers:

(a) 3025

5 x 6 = 30


(b) 4225

6 x 7 = 42


(c) 5625

7 x 8 = 56


(d) 11025

10 x 11 = 110


(e) 42025

20 x 21 = 420


(f) 119025

34 x 35 = 1190


(g) 990025

99 x 100 = 9900

Related Concept

● Patterns and Mental Mathematics

● Counting Numbers in Proper Pattern

● Odd Numbers Patterns

● Three Consecutive Numbers

● Number Formed by Any Power

● Product of The Number

● Magic Square

● Square of a Number

● Difference of The Squares

● Multiplied by Itself

● Puzzle

● Patterns

● Systems of Numeration







4th Grade Math Activities

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