Quickly Square Numbers Ending in 5 - Mathematical Tricks!

Remember: If a number is ending in 5, Its square will always end in 25

Method: 85 x 85 = 7225

Step 1. Multiply the 1st digit by 1st digit plus 1: 8 x (8+1) = 72

Step 2. Write the numbers 25 next to the result from the first step: 7225

Eg. 45 x 45 = 2025

Step 1. 4 x (4 + 1) = 20

Step 2. 2025

Larger Numbers – Same method: Use all the digits others then ending 5 for the 1st step

Eg. 115 x 115 = 13225

Step 1. Use the 1st two digits 115. So, 11 x 12 = 132

Step 2. Write 25 next to it: 13225

Eg. 12345 x 12345

Step 1: 1234 x 1235 = 1523990

Step 2: Write 25 next to the result: 152399025

Now practice it:

15 x 15 = ?

65 x 65 = ?

55 x 55 = ?

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