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Luis uses a paper-and-pencil method to solve 2
− 1
like the one he used to add fractions. First he finds a common denominator.
− 1 like the one he used to add fractions. First he finds a common denominator.
2 = 2
2 − 1
He subtracts the whole numbers and then subtracts the fractions.
Ana tries a different paper-and-pencil method. First she changes each mixed number to an improper fraction.
2 = 
1 = 
Then she finds a common denominator and subtracts.
= 
She changes the improper fraction to its simplest form.
= 1
Use the Fractions on Number Lines Chart, Fraction Chart, or Multiplication and Division Facts in the Reference section to help you find equivalent fractions.
- Estimate the differences. Then solve the problems using fraction circle pieces, mental math, or paper and pencil. Record your work. Check for reasonableness.
- 4
− 2
- 3
− 1
- 3
− 1
- 2 − 1
- Explain how you know your answer for Question 1D is reasonable.