NF.1.2

Solve word problems involving addition and subtraction of fractions referring to the same whole, including cases of unlike denominators, e.g., by using visual fraction models or equations to represent the problem. Use benchmark fractions and number sense of fractions to estimate mentally and assess the reasonableness of answers. For example, recognize an incorrect result 2/5 + 1/2 = 3/7, by observing that 3/7 is less than 1/2.

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Formative Assessments
Formative Assessments
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Students are asked to estimate the sum of two mixed numbers and then calculate the sum.
Baking Cakes
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Students are asked to estimate the difference between two fractional lengths and then calculate the difference.
Sarah’s Hike
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Students are given a word problem involving subtraction of fractions with unlike denominators. Students are asked to determine if a given answer is reasonable, explain their reasoning, and calculate the answer.
Just Run
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Students are given a word problem involving fractions with unlike denominators and are asked to estimate the sum, explain their reasoning, and then determine the sum.
Maris Has a Party
Virtual/Hands-on Manipulatives
Virtual/Hands-on Manipulatives
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CPALMS: Students can use this tool under activities to show fractions visually.
Use Fraction Bars To Show Fractions
Assessment Questions
Assessment Questions
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Equation Editor 1
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Multiple Choice 2
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Equation Editor 2
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Multiple Choice 1
Videos of Expert Instruction
Videos of Expert Instruction
Use Real Link and Title
Use Real Link and Title
Use Real Link and Title
Hook/Performance Tasks
Hook/Performance Tasks
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This task addresses common mistakes that students make when adding fractions.
IM:  Do These Add Up?
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The purpose of this task is to have students add fractions with unlike denominators and divide a unit fraction by a whole number.
IM:  Salad Dressing
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This task requires students to think about how a single situation involving fractions can be accurately represented using addition or multiplication.
IM:  Sharing Lunches
Problem Based Lessons
Problem Based Lessons
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Robert Kaplinsky: Students determine how far exits signs are on the freeway by having conversations.
How Far Apart Are The Freeway Exits?