SQUARING A NUMBER IN THE RANGE OF 50-59

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.