Rapid Math
Finding the Square of a two digit Number
Examples
Method 1
Reasoning:
For example 1:
This process also can be written as:
Rapid Math:
That is, step1: Square the second digit followed by square the first digit, which equals to 949.
Step2: Multiplying the ones digit with tens digit, and then double of it, which equals to 420
Step3: Plus the numbers form step1 and Step2 to get the final answer, 949 + 420 = 1369.
Example 2:
Method 2
For a number like 79, even 78 we can apply another Algebra formula
For example 3:
Example 4:
Rapid Math:
Academic Success Centre
Prepared by Ming H. XU
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