Math Calculations: Simplified --- Part 2
This is part 2 of the Math Calculations: Simplified blog. Welcome back! This time I’m going to share tricks about counting squares such as 41 2 or 52 2 . There are 2 simple methods that I am going to explain. Here is the first one: METHOD 1 For numbers that begin with 1, the formula is simple: (N-1)²+ (2N-1). For example, let’s calculate 51². The equation becomes (50)² + (101). It is now easy to figure out the solution, which is 2601. This method makes it much easier to do these types of calculations rather than using the traditional method of carry-multiplying. Next, we have the 2 digit numbers that begin with 9. We can figure this out by using pretty much the opposite of the method used to calculate the square of one digit numbers. The formula: (N+1)² - (2N+1). Let’s use 29² as an example. We put this into the equation, which makes it (30)² - (59). That leads to a solution of 841. This method also helps with these types of calculations. ...