To square any number that ends in 5,
simply

Multiply the ten's (left) digit(s) by the next higher digit (itself+1)Attach 25 at the end

Example: If the number to be squared is
35;

Notice, the first digit is 3, and the
next higher number to 3 is 4.

So, the first part of the answer is 3 ×
4 = 12 (first digit multiplied by next higher digit). And the last part of the
answer is always 25.

So,

**35**^{2}= 1225The answer is in two parts: The first part is the first number; which is 7, multiplied by the next higher number that is 8; giving (7 x 8 =)

**56.**The last part is always

**25,**giving the final answer

**5625.**

**65**

^{2}= 4225

**95**^{2}= 9025We can also square 3-digit numbers this way, by starting with the first two digits:

**Example**:

**125**

^{2}=?
a.
First part is 12 × 13 = 156

b.
The last part is

**25**.
So,

**125**^{2}= 15,625
Similarly,

**995**= 99 × 100 = 9900 and 25; that is^{2}**990025**.
Why will this not share...? :-(

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