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 in the 900s
 Choose a number in the 900s  start out easy with numbers near 1000; then go
lower when expert.
 Subtract the number from 1000 to get the difference.
 The first three places will be the number minus the difference: X X X _ _ _.
 The last three places will be the square of the difference: _ _ _ X X X
(if 4 digits, add the first digit as carry).
Example:
 If the number to be squared is 985:
 Subtract 1000  985 = 15 (difference)
 Number  difference: 985  15 = 970: 9 7 0 _ _ _
 Square the difference: 15 × 15 = 225: _ _ _ 2 2 5
 So 985 × 985 = 970225.
See the pattern?
 If the number to be squared is 920:
 Subtract 1000  920 = 80 (difference)
 Number  difference: 920  80 = 840: 8 4 0 _ _ _
 Square the difference: 80 × 80 = 6400: _ _ _ 4 0 0
 Carry first digit when four digits: 8 4 6 _ _ _
 So 920 × 920 = 846400.
