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.

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

● Puzzle

● Patterns

**4th Grade Math Activities**

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