Squaring Numbers
Multiplying Numbers
Dividing Numbers
Adding Numbers
 even numbers 2 through selected 2digit evens
 digits of square of repeating ones
 consecutive odds
 consecutive between 2 numbers
 sequence from 1 to selected 2digit number
 sequence from 1 to selected 1digit number and back
 sequences in the 10's
 sequences in the 20's
 sequences in the 30's
 sequences in the 40's
 sequences in the 50's
 sequences in the 60's
 sequences in the 70's
 sequences in the 80's
 series of doubles
 series of quadruples
 series of 10 numbers
Subtracting Numbers
 1's repeating, divide by 9, subtract 21
 8's repeating, divide by 9, subtract 10
 squares of two numbers
 reversing/adding/subtracting 3digit numbers
Percents
 finding 2.5 percent
 finding 5 percent
 finding 15 percent
 finding 20 percent
 finding 25 percent
 finding 33 1/3 percent
 finding 40 percent
 finding 45 percent
 finding 55 percent
 finding 60 percent
 finding 70 percent
 finding 75 percent
Calculation
Practice Exercises
Full List

Subtracting
the squares of two numbers
 Select a 2digit number and then choose a number two larger or two smaller.
 Multiply the middle number by 4.
Example:
 If the the first number selected is 31:
 Choose 29.
 Multiply the number between them by 4: 4 × 30 = 120
 So (31)(31)  (29)(29) = 120.
See the pattern?
 If the the first number selected is 63:
 Choose 61.
 Multiply the number between them by 4: 4 × 62 = 248
 So 63^2  61^2 = 248.
One more:
 If the the first number selected is 73:
 Choose 75.
 Multiply the number between them by 4: 4 × 74 = 296
 So (75x75)  (73x73) = 296.
