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Common Denominator 1. List mutliples of the first number: start with the number and multiply by 1, 2, 3 etc. 2. List multiples of the second number 3. Circle the smalles number they have in common Fractions area is units² Add/Subtract Fractions Measurement volume is units³ 12 inches = 1 foot 1. Find common denominator 2. Add/Subtract 3 feet = 1 yard Multiply-“divide out” and multiply 1 centimeter = 10 millimeters 1. Mixed numbers change to improper fractions 2. Multiply 1 meter = 100 centimeters or 1000 millimeters 1 kilometer = 1000 meters Divide-multiply by the reciprocal 1. Mixed numbers change to improper fractions 2. Change division sign to multiplication 3. Write the reciprocal of the second fraction 4. multiply Mean: Statistics Median: man Range: subtract Graphing (x,y) Transformations Translation Rotation Reflection Approved by DESE 4/2014 Acute Scalene Right Isosceles Obtuse Equilateral 7th Grade MCAS INDIVIDUALIZED REFERENCE SHEET Converting Fractions/Decimals/Percents Decimal→%: move decimal Probability P= favorable outcomes total outcomes %→decimal: move decimal %→fraction: write % over 100 Percent equation: % ∙ whole = part Proportions Criss-cross is equal A = C AD=BC B D Integers │absolute value │ Addition negative + negative = negative positive + negative = subtract and use sign of the “larger” number Subtraction (add the opposite) 1. Copy 1st number 2. Change subtraction sign to addition 3. Change the sign of the second number and add Multiplication and Division same signs = positive answer different signs = negative answer Approved by DESE 4/2014 Decimals Add or Subtract 1. Line up decimal points 2. If necessary add zeros 3. Bring decimal point straight down 4. Find the sum or difference Multiply: after you multiply, count the number of decimal places Dividing: 1. If the divisor has a decimal point, move the decimal point in the dividend 2. Bring the decimal point straight up into the quotient and divide