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Extra resources for Algebra I (Cliffs Quick Review)
30 is what percent of 50? 2. 30 is 20% of what number? 3. What number is 30% of 50? F 32 4/27/01 9:37 AM Page 32 CliffsQuickReview Algebra I Scientific Notation Very large or very small numbers are sometimes written in scientific notation. A number written in scientific notation is a number between 1 and 10 multiplied by a power of 10. Example 29: Express the following in scientific notation. 1 × 106. Simply place the decimal point to get a number between 1 and 10 and then count the digits to the right of the decimal to get the power of 10.
So 37% = 37⁄100 Changing decimals to percents To change decimals to percents, 1. Move the decimal point two places to the right. 2. Insert a percent sign. 85 = 185% Changing percents to decimals To change percents to decimals, 1. Eliminate the percent sign. 2. Move the decimal point two places to the left (sometimes, adding zeros will be necessary). 05 Changing fractions to percents To change fractions to percents, 1. Change to a decimal. 2. Change the decimal to a percent. 05 = 5% Changing percents to fractions To change percents to fractions, 1.
Understood multiplication When two or more letters or a number and letter(s) are written next to each other, they are understood to be multiplied. Thus, 8x means 8 times x (x8 is never written). Or ab means a times b. Or 18ab means 18 times a times b. Parentheses also represent multiplication. Thus, 3(4) means 3 times 4. A raised dot also means multiplication. Thus, 6 ⋅ 5 means 6 times 5. Letters to be aware of Although they may appear in some texts, don’t use o, e, or i as variables. ) When using z, you may wish to write it as z so it is not confused with 2.