^{2}approach to mental number squaring, the concept is to split the original number to one having 10's. It is similar to the ( a + b)

^{2}approach but differs in the expanded expression.

Principle: (a - b)

^{2}= a

^{2}- 2ab + b

^{2}

Example: 34

^{2}

Step 1: Split 34 into 40 - 6

Step 2: Replace 34

^{2}by (40 - 6)

^{2}

Step 3: Expand Step 2. 40

^{2}- 2(40)(6) + 6

^{2}

Mentally it is easy to do 40

^{2}= 1600.

Mentally it is also simple to do 6

^{2}= 36.

Adding the above 2 results mentally is also easy, 1600 + 36 = 1636, with the "00" aiding the process.

Next, we need to perform the centre term "2ab" ==> 2(40)(6) = 480

Subtracting this last maths operation result of 480 from the 1636 gives

**1156**(ANSWER).

The last operation of subtracting is the obstacle in speed compared to the other approaches in

**Mental Number Squaring**.

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