mental math strings
DESCRIPTION
Mental Math Strings. Mentally:. Start with the number of sides in a pentagon. Add the number of sides in a triangle. Divide by the number of sides in an octagon. Multiply by the number of diagonals in a rectangle. Add the minimum number of points needed to determine a line. - PowerPoint PPT PresentationTRANSCRIPT
Mental Math Strings
1. Start with the number of sides in a pentagon.
2. Add the number of sides in a triangle.3. Divide by the number of sides in an
octagon.4. Multiply by the number of diagonals in a
rectangle.5. Add the minimum number of points
needed to determine a line. 6. Add the square of the number of angles
in a parallelogram.7. Divide by the square root of the number
of sides in a trapezoid.
Mentally:
Start with the number of sides in a pentagon. 5Add the number of sides in a triangle. 5 + 3 = 8Divide by the number of sides in an octagon. 8/8 = 1Multiply by the number of diagonals in a rectangle 1 * 2 = 2Add the minimum number of points needed to determine a line.
2 + 2 = 4Add the square of the number of angles in a parallelogram
4 + 42 = 20Divide by the square root of the number of sides in a trapezoid
20/2 = 10
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.
Using Pencil and Paper:
Consider y = 6x + 12Write 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.
6 + -1 = 5
Multiply that by the square of the zero of the function.
5 * 4 = 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 that result “x” and find tan(x).