Prerequisite Material

Prerequisite Material:

Rounding Rules:

1)  ______

2)  ______

3)  ______

Rounding:

a) Round to the nearest tenth: 17.8816

b) Round to the nearest hundredth 3.278231973

c) Round to the nearest whole number 78.9917

d) Round to the nearest ten-thousandth 3.78912389

e) Round to the nearest integer 1237.89231789231

Percents, Decimals, Fractions:

Express as a decimal: a) 3/8 b) 5/11 c) 2 and 1/6 d) -2 and ¾

e) 7/60 f) 3 and 1/7 g) 1 and 1/20 h) 1/90

Express as a fraction: a) 5 b) .75 c) 3 and ½ d) 4.1

(in lowest terms) e) .27 f) .23 g) .83 h) .142875

Percents: (All fractions are to be in lowest terms!)

a) What is 15% of 165? b) What % of 145 is 122?

c) What is 112% of 95? d) What # is 28.5% of 92?

e) What # is 66.658% of 216? f) What % of 774.25 is 133.66?

g) Write 0.581 as a percent. h) Write 3% as a decimal.

i) Write 7/20 as a percent. j) Write 4.4% as a fraction.

k) Write ¼% as a decimal. l) Write 68% as a fraction.

m) Write 9/11 as a percent. n) Write .654 as a percent.

Scientific Notation:

Write each number in scientific notation:

a) 40.7 b) 0.0053 c) 3920 d) 9.05 e) 0.00000007

Write the number in ordinary decimal notation:

f) 1.87 x 104 g) 5.2 x 101 h) 2.91 x 10-6

i) 3.55 x 10-1 j) 7.6 x 102 k) 6.82 x 10-3

l) 8.76 x 100 m) 1.25 x 10-8 n) 3.6 x 107

Multiply or divide as indicated and express in correct scientific notation:

o) (2.85 x 107)(3.16 x 10-3) p) _9.12 x 10-5_

3.8 x 106

q) _(6.2 x 103)(3.8 x 105)_ r) _(1.5 x 104)(6.25 x 10-3)_

1.9 x 104 1.25 x 10-4

Scientific Notation and the Calculator:

If a problem is already expressed in scientific notation, it may be possible to simply enter the problem on the home screen in Normal mode to arrive at the answer.

Example: Express 4.726 x 10-3 in decimal notation

*** In Normal mode, if the answer cannot be displayed in 10 digits or the absolute value is less than .001, the answer will appear in scientific notation.

Example: Multiply 223 by 100,000,000.

If a problem asks for the answers to be expressed in scientific notation, change the mode to SCI (scientific mode).

Example: The distance from the Earth to the Sun is approximately 93 millions miles. Express this number in scientific notation.

*** In scientific mode (SCI), all answer will be expressed in scientific notation. The calculator is using the notation 9.3E7 to mean 9.3 x 107. To insert E into a calculation, press 2nd (comma). The face of the calculator reads EE above the comma key, but only one E will appear on the screen for your scientific notation. The E can be used in either normal or SCI mode. The EE is used in engineering mode.