Hudson City Schools / Homepage



Chapter 2 Review Sheet Test Date: __________Fractions, Decimals, & PercentsHow to prepare for a math testRead through this review sheet to determine what you know and what you don’t know. Focus your study time on what you don’t know first.Review vocabulary, reference sheets, notes, and key conceptsTry problems from the practice packet in your binder. Remember, answers are on the back!Go to Log in and use any of these resources:Watch – a purple button that is a personal tutor for each conceptCheck – the red check mark that is a quick quiz on a conceptResponse to Intervention – RtI button has very basic explanations of concepts with additional practice pagesWorksheets – a green button that has extra worksheets for concepts you may want to practice moreAsk for help! See Mrs. Blue during team support; ask a friend or a parent.Get a good night’s sleep and eat a good breakfast!Key ConceptsDecimals & FractionsWrite decimals as fractions or mixed numbersHint: say the decimal properly & you will hear the fraction!Write fractions & mixed numbers as decimalsScale up to a denominator of 10, 100, 1000 etc. then say the fraction & you’ll hear the decimal.Use long division: numerator ÷ denominatorPercents & FractionsPercent means “part per 100”Write a percent as a fraction: percent100 Ex: 5% = 5100Write a fraction as a percentMake an equivalent fraction out of 100If the denominator can’t be scaled up easily to 100, then scale down to a factor of 100, then scale back up to 100Percents & DecimalsWrite percents as decimalsWrite the percent as a fraction out of 100, say the fraction, write the decimalDivide the percent by 100 ~ this moves the decimal point left two placesWrite decimals as percentsThe numbers in the first two places are the % Ex: 0.38 = 38%Don’t lop off the extra digits. Ex: 0.3875 = 38.75%Say the decimal, write it as a fraction, find an equivalent fraction out of 100, the numerator is the %Multiply the decimal by 100 ~ this moves the decimal point to the right 2 placesPercents > 100% & <1%100% = 1.00.2% ≠ 20% 0.2% is 210%, this is less than 1%, be careful how you write it! 0.2% = 0.002To convert mixed numbers or decimals >1.0 to a percent, split the problem apart. Find the % for the whole number and the percent for the fraction/decimal and add them.Ex: 2 15 2 = 200% 15 = 20% so 200% + 20% = 220%Ordering Fractions, Decimals, PercentsCompare the numbers in the same form. Equivalent fractionsPercentsLook at place value in decimals10% ThinkingFind 10% of a number by dividing by 10Ex: 10% of 240 = 24Then use the value of 10% to find any other percent of a number by scaling up or downEx:10% = 2420% = 48 (doubled 10%)5% = 12 (split 10% in ?)Estimate the % of a numberUse compatible numbers – numbers that work together easilyShould be easy mental math problemsStrategies:10% ThinkingFractionsEquivalent ratiosRate out of 100Find the percent of a numberUse 10% thinkingMultiply the percent (as a fraction) by the numberMultiply the percent (as a decimal) by the numberDetermine the price of an item that is on saleProportionsWhat is a proportion?In a percent proportion one ratio compares partwhole and the other ratio represents the percent as percent100How can proportions help you solve for unknown quantities?Solve percent proportions.Ex: 75 is 15% of what #? ................
................

In order to avoid copyright disputes, this page is only a partial summary.

Google Online Preview   Download