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(*) Squaring A Number In The Range
(50 – 59):
A. This method comes from
algebra:
(50 + a)2
= 100(25 + a) + a2
B. Using numbers instead of
variables we get the following:
1.
Square the one’s digit and write it down (make sure it takes up 2 place
values).
2.
Add 25 to the one’s digit. Write
this result.
Ex [1] 532 =_________.
a)
32 = 9. Write 09
to take up 2 place values.
b)
25 + 3 = 28. Write 28.
c)
The answer is 2809.
Ex [2] 592 =_________.
a)
92 = 81. Write
81.
b)
25 + 9 = 34. Write 34.
c)
The answer is 3481.
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