Praxis Core Math Practice Test Questions and Answers

Proper Fraction A fraction that represents a quantity that is less than 1 Improper Fraction A fraction that represents a quantity that is more than one How to Raise a Fraction Multiply both terms by the same number How to Reduce a Fraction Divide both terms by the same number Common Denominator & How to Find it The numbers below the fraction bar are the same. To find it is to list the multiples of of both denominators Ex. 5/6 + 1/4 Multiples of 6: 6,12,18 Multiples of 4: 4,8,12,16 12 is the common denominator How to Multiply fractions multiply numerators then the denominators. Reduce to lowest terms if necessary. If mixed number turn to improper fraction How to Divide Fractions Invert the divisor (the fraction you are dividing by) by switching its numerator and the denominator. Then multiply the fractions. Ex. 8 Devide at by 1/2. 8 (/) 1/2 = 8/1 (/) 1/2 8/1 x 2/1 = 16/1 = 16 Part-to-part ration example Rate of blue compared to rate of red marbles in a bag Part-to-whole ration example rate of blue marbles in a bag of 100 Proportion An equation thta shows that two ratios are equal. In other words, if you multiplly across the equal sign, the products are equal. Ex. 2 cups of water to every two scoops of drink mix. How many cups of water will you need for 12 scoops of drink mix? cups/scoops = 3/2 = 12/8 3 x 8 = 24 2 x 12 = 24