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Example of an open-ended math problem using the math rubric: Example of a 4: 3 5/16 – 2 1/8 To find the difference of 2 1/8 from 3 5/16, I find equivalent fractions using the LCD (least common denominator) of 8 and 16. Next, I subtract the whole numbers, 2 from 3 to get 1, and then subtract the fractions 2/16 from 5/16 to get 3/16. Then I add the whole number, 1, to the fraction 3/16 to get 1 3/16. Example of a 3: 3 5/16 – 2 1/8 To find the answer of 2 1/8 from 3 5/16, I find equivalent fractions using the LCD. Next I subtract my whole numbers to get 1, and then I subtract my fractions to get 3/16. Then I add the whole number to the fraction to get 1 3/16. Example of a 2: 3 5/16 – 2 1/8 3 5/16 – 2 1/8 I first need to get the same fractions then subtract. Then 3 – 2 to get 1. Then 5/16 – 2/16 to get 3/16. So 3 5/16 – 2 1/8 = 1 3/16. Example of a 1: 3 5/16 – 2 1/8 3 5/16 – 2 1/8 you first need to get the same fractions. Then subtract the 3 – 2 and that will give you 1 3/16. Example of a 0: 3 5/16 – 2 1/8 3 5/16 – 2 1/8 = 1 4/8 or 1 1/2. Just subtract the 3 – 2 and 5/16 – 1/8 then reduce to 1 1/2.