Decompose Whole Number and Decimal Operation Fractions Add decimal numbers Subtract decimal numbers IF the numerator and denominator: Both are even, divide by 2 Both end with 0 or 5, divide by 5 If not, then try 3 or 7 Keep dividing by 1 of the 4 numbers until the Multiply decimal Divide Decimal fraction is in lowest Multiply normally, ignoring the decimal points. Divide as usual terms. Then put the decimal point in the answer - it will have as Put decimal point directly many decimal places as the two original numbers combined. above decimal point in the dividend. Fractions Operation Add Fractions Subtract Fractions Divide Fractions Common Denominator? Common Denominator? Strategy: multiply by Add numerators Can you take away? If reciprocal 1. change division sign Improper? Change to mix number no, change 1 whole to multiplication sign Reduce? number to a fraction 1= Add the whole number part of the answer to the mix Subtract numerators 2 invert (flip) the 2nd number. Reduce? number Subtract whole number 3 multiply numerator by numerator and denominator by denominator
Whole Number and Decimal Operation Decompose Fractions Add decimal numbers Subtract decimal numbers IF the numerator and denominator: Both are even, divide by 2 Both end with 0 or 5, divide by 5 If not, then try 3 or 7 Keep dividing by 1 of the 4 numbers until the fraction is in lowest terms. Multiply decimal Divide Decimal Multiply normally, ignoring the decimal points. Then put the decimal point in the answer - it will have as many decimal places as the two original numbers combined. Divide as usual Put decimal point directly above decimal point in the dividend. Fractions Operation Add Fractions Common Denominator? Add numerators Improper? Change to mix number Reduce? Add the whole number part of the answer to the mix number. Subtract Fractions Common Denominator? Can you take away? If no, change 1 whole number to a fraction 1= Subtract numerators Reduce? Subtract whole number Divide Fractions Strategy: multiply by reciprocal 1. change division sign to multiplication sign 2 invert (flip) the 2nd number 3 multiply numerator by numerator and denominator by denominator
5th_hw_cheatsheet.docx