Math Tips | |||||
Here are some "how-to's" that will come in handy. How to Round a NumberTo the nearest ten If the ones digit is 5 or more, round to the next highest ten (68 rounds to 70). To the nearest hundred If the tens digit is 5 or more, round to the next highest hundred (384 rounds to 400). To the nearest thousand If the hundreds digit is 5 or more, round to the next highest thousand (7,602 rounds to 8,000). How to Find an AverageTo find the average of several numbers, add the numbers together and then divide the sum by the number of numbers. The average of 17, 30, 6, and 7 = 60 ÷ 4 = 15 How to Tell if Two Fractions are EquivalentCross multiply the fractions. If both products are the same, the fractions are equivalent. 3 and 9 3 x 24 = 72 3 and 9 are equivalent fractions. 5 and 3 5 x12 = 60 5 and 3 are not equivalent fractions. How to Find a PercentageTo tell what percentage one number is of a second number, divide the first number by the second. Move the decimal point of the resulting quotient two places to the right. Example: What percentage is 20 of 300? How to Change a Fraction to a PercentageDivide the numerator by the denominator. Move the decimal point of the resulting quotient two places to the right. 6 = 6 ÷ 15 = .4 = .40 = 40% How to Change a Decimal to a PercentageMove the decimal point two places to the right. 0.792 = 79.2% Refer to these how-to's until you can do them automatically. |