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



Systems of Numeration

4th Grade Math Activities

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