Mental Math Strings

1. Begin with today’s date. (9/28/2012) (day only)

2. Add the digits.3. Multiply by the date of the last

day of this month.4. Multiply by one third.5. Take the square root.6. Add ‘3 squared’ twice.

Start with today’s date (9/28/2012) (day only) 28

Add the digits2 + 8 = 10

Multiply by the date of last day of this month. 10 * 30 = 300

Multiply by one third.300*(1/3) = 100

Take the square root. (100) = 10

Add ‘3 squared’ twice.10 + 32 + 32 = 28

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 square of the number of sides in a

parallelogram6. 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 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 the number of years in 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. 12 + 6 = 18

Divide that by the x-intercept. 18/-2 = -9

Add the value of y when x = ½ . -9 + 15 = 6

Add the value of x when y is 6. -1 + 6 = 5

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

5 *(-2)*(-2) = 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. If x equals your result in #7, write down

the tan(x).