Rule: Add the units digit to 25 and affix the square of the units digit to the result. If the square of the units digit is a one-digit number, precede it with a 0.
Find the square of 53, using this method.
First, add the units digit, 3 to 25.
25 + 3 = 28
Next, affix the square of the units digit to the result.
3 X 3 = 9
Since the answer is a one-digit number, place a zero in front of 9 before affixing it to the 28.
2,809 Answer
As another example, find the square of 57.
Again, the units digit is added to 25.
25 + 7 = 32
Next,square the units digit
7 X 7 = 49
and affix to the previous result.
3,249 Answer
This time the square of the units digit was a two-digit number, and therefore it was not necessary to precede it with a zero.
Find the square of 53, using this method.
First, add the units digit, 3 to 25.
25 + 3 = 28
Next, affix the square of the units digit to the result.
3 X 3 = 9
Since the answer is a one-digit number, place a zero in front of 9 before affixing it to the 28.
2,809 Answer
As another example, find the square of 57.
Again, the units digit is added to 25.
25 + 7 = 32
Next,square the units digit
7 X 7 = 49
and affix to the previous result.
3,249 Answer
This time the square of the units digit was a two-digit number, and therefore it was not necessary to precede it with a zero.
0 comments:
Post a Comment