Mental Math Strings

1. Start with today’s date (1/19/2011) (day only)

2. Add the digits3. Multiply by the day of the

month of tomorrow4. Multiply by ½5. Take the square root6. Add ‘3 squared’

Start with today’s date (1/19/2011) (day only) 19

Add the digits1+9 = 10

Multiply by the day of the month of tomorrow 10 * 20 = 200

Multiply by ½200*1/2 = 100

Take the square root10

Add ‘3 squared’10+32 = 10+9 = 19

100

1. Start with the number of sides in a pentagon

2. Add the number of sides in a triangle3. Divide by the number of sides in a

rhombus4. Multiply by the number of diagonals in a

rectangle5. Add the number of linear sides of a circle6. Add the square of the number of sides in a

parallelogram7. Divide by the square root of the number of

sides in a trapezoid

Start with the number of sides in a pentagon 5

Add the number of sides in a triangle 5+3 = 8

Divide by the number of sides in a rhombus 8/4 = 2

Multiply by the number of diagonals in a rectangle 2*2 = 4

Add the number of sides in a circle 4+0 = 4

Add the square of the number of sides in a parallelogram

4+42 = 4+16 = 20

Divide by the square root of the number of sides in a trapezoid

10

4

20

1. Start with the year the US declared its independence

2. Add the digits3. Multiply by 104. Add three decades5. Divide by 86. Add the number of eggs in a dozen7. Divide by number of eggs in half a

dozen8. Square that number

Start with the year the US declared its independence 1776

Add the digits1+7+7+6 = 21

Multiply by 1021*10 = 210

Add three decades210 +3(10) = 240

Divide by 8240/8 = 30

Add the number of eggs in a dozen 30+12 = 42

Divide by number of eggs in half a dozen 42/6 = 7

Square that number72 = 49

1. Consider y = 6x + 12.2. Write down the y-intercept.3. Add the slope of the line.4. Divide that by the x-intercept.5. Add the value of y when x = ½ .6. Add the value of x when y is 6.7. Multiply that by the square of the zero

of the function.

Consider y = 6x + 12

Write down the y-intercept. 12

Add the slope of the line. 18

Divide that by the x-intercept. -9

Add the value of y when x = ½ . 6

Add the value of x when y is 6. 5

Multiply that by the square of the zero of the function.

20

1. Write down the tan 45° .2. Divide that by the sin 30° .3. Cube this value.4. Multiply that result by cos 120° .5. Add the sin 270° .6. Multiply by cos 180° .7. Multiply by 5π/4 .8. Call your answer x and write down the

tan(x).

Write down the tan 45° . 1

Divide that by the sin 30° . 2

Cube this value. 8

Multiply that result by cos 120° . -4

Add the sin 270° . -5

Multiply by cos 180° . 5

Multiply by 5π/4 . 25π/4

Call your answer x and write down the tan(x).

1