Math Tricks-Squares Ending in 5

Example 1: 452 =??

Step 1:  Let 1st digit is N= 4

Use formula, N*(N+1)= 4*(4+1)= 20

Step 2:  2nd digit =5

Then, 52 = 25

Step 3:  452 = write step 1 and then step2

452 = 2025

 

Example 2: 2052 =??

Step 1:  Let 1st digit is N= 20

Use formula, N*(N+1)= 20*(20+1)= 420

Step 2:  2nd digit =5

Then, 52 = 25

Step 3:  452 = write step 1 and then step2

2052 = 42025

Exercise:

<i.>           352               <ii.>    652                            <iii.>    1152

 

 

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