Squaring Numbers
 beginning with 1
 beginning with 5
 beginning with 9
 ending in 1
 ending in 2
 ending in 3
 ending in 4
 ending in 5
 ending in 6
 ending in 7
 ending in 8
 ending in 9
 made up of 1's
 made up of 3's
 made up of 6's
 made up of 9's
 in the 20's
 in the 30's
 in the 40's
 in the 50's
 in the 60's
 in the 70's
 in the 80's
 in the 100's
 in the 200's
 in the 300's
 in the 400's
 in the 500's
 in the 600's
 in the 700's
 between 800810
 in the 900's
 between 10001100
 between 20002099
 between 30003099
 between 40004099
 between 50005099
 between 60006099
 between 70007099
 3's and final 1
 3's and final 2
 3's and final 4
 3's and final 5
 3's and final 6
 3's and final 7
 3's and final 8
 3's and final 9
 6's and final 1
 6's and final 2
 6's and final 3
 6's and final 4
 6's and final 5
 6's and final 7
 6's and final 8
 6's and final 9
 9's and final 1
 9's and final 2
 9's and final 3
 9's and final 4
 9's and final 5
 9's and final 6
 9's and final 7
 9's and final 8
 1 and repeating 3's
 1 and repeating 6's
 1 and repeating 9's
 2 and repeating 3's
 2 and repeating 6's
 2 and repeating 9's
 3 and repeating 6's
 3 and repeating 9's
 4 and repeating 3's
 4 and repeating 6's
 4 and repeating 9's
 5 and repeating 3's
 5 and repeating 6's
 5 and repeating 9's
 6 and repeating 3's
 6 and repeating 9's
 7 and repeating 3's
 7 and repeating 6's
 7 and repeating 9's
 8 and repeating 3's
 8 and repeating 9's
 9 and repeating 3's
 9 and repeating 6's
 6digits repeating
 2 rep./sq. of 1 digit
Multiplying Numbers
Dividing Numbers
Adding Numbers
Subtracting Numbers
Finding Percents
Calculation
Practice Exercises
Full List

Squaring numbers between 4000 and 4099
 Choose a number between 4000 and 4099.
 For numbers less than 4013:
 The first three digits are: 1 6 0 _ _ _ _ _
 The next two digits are 8 times the last two digits:
_ _ _ X X _ _ _
 For the last three digits, square the last two digits
in the number chosen (insert zeros when needed):
_ _ _ _ _ X X X
Example:
 If the number to be squared is 4005:
 The first three digits are: 1 6 0 _ _ _ _ _
 The next two digits are 8 times the last two:
8 × 5 = 40: _ _ 4 0 _ _ _
 For the last three digits, square the last two:
5 × 5 = 25: _ _ _ _ _ 0 2 5
 So 4005 × 4005 = 16,040,025.
See the pattern?
For numbers greater than 4012, reverse the order:
 If the number to be squared is 4080:
 For the last three digits, square the last two:
80 × 80 = 6400, carry 6: _ _ _ _ 4 0 0
 The middle two digits are 8 times the last two (keep the carry):
8 × 80 = 640 (keep carry of 6), 40 + 6:
_ _ _ 4 6 _ _ _
 The first three digits are 160 + the carry:
160 + 6 = 166: 1 6 6 _ _ _ _ _
 So 4080 × 4080 = 16,646,400.
