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Tham khảo tài liệu 'symbols of addition 4', ngoại ngữ, anh ngữ phổ thông phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | THEA MATH REVIEW Example Convert -4g to an improper fraction. 5 4 X 6 5 29 Temporarily ignore the negative sign and perform the conversion 457 6 6 . 29 6 6 6 The final answer includes the negative sign - 6 . To convert from an improper fraction to a mixed number simply treat the fraction like a division problem and express the answer as a fraction rather than a decimal. Example Convert 7 to a mixed number. Perform the division 23 7 3-7. Percents Percents are always out of 100. 45 means 45 out of 100. Therefore to write percents as decimals move the decimal point two places to the left to the hundredths place . 45 T0o 0.45 3 Ĩ3Õ 0.03 124 0 1.24 _ _ .9 0.9 -100 T000 0.009 Here are some conversions you should be familiar with Fraction Decimal Percentage 1 2 .5 50 1 4 .25 25 1 3 .333 . . . 33.3 2 3 .666 . . . 66.6 -L 10 .1 10 1 8 .125 12.5 7 6 .1666 . . . 16. 5 1 5 .2 20 105 --------------------------------- THEA MATH REVIEW --------------------------------------- Absolute Value The absolute value of a number is the distance of that number from zero. Distances are always represented by positive numbers so the absolute value of any number is positive. Absolute value is represented by placing small vertical lines around the value x . Examples The absolute value of seven 7 . The distance from seven to zero is seven so 7 7. The absolute value of negative three 3 . The distance from negative three to zero is three so 3 3. Exponents Positive Exponents A positive exponent indicates the number of times a base is used as a factor to attain a product. Example Evaluate 25. 2 is the base and 5 is the exponent. Therefore 2 should be used as a factor 5 times to attain a product 25 2 X 2 X 2 X 2 X 2 32 Zero Exponent Any non-zero number raised to the zero power equals 1. Examples 50 1 700 1 29 8740 1 Negative Exponents A base raised to a negative exponent is equivalent to the reciprocal of the base raised to the positive exponent absolute value of the exponent . 106 .
