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Problem Solving for the 21st Century: Built for the Common Core

Helping Grandmother

Jackson's grandmother is moving to a new house. Grandmother has eighty-seven boxes for Jackson to put in the truck! Jackson puts thirty-one boxes in the truck before breakfast. Jackson puts thirty-six boxes in the truck before lunch. Jackson puts fourteen boxes in the truck before dinner. How many boxes are left for Jackson to put in the truck after dinner? Show all your mathematical thinking.

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instructional
Domain:
Aligned Standard:
Mathematical Practices:
  • MP.1
  • MP.1

    Make sense of problems and persevere in solving them.

  • MP.3
  • MP.3

    Construct viable arguments and critique the reasoning of others.

  • MP.4
  • MP.4

    Model with mathematics.

  • MP.6
  • MP.6

    Attend to precision.

View all Grade 2 tasks

More Accessible Version

Jackson's grandmother is moving to a new house. Grandmother has sixty-eight boxes for Jackson to put in the truck! Jackson puts twenty-one boxes in the truck before breakfast. Jackson puts twenty-six boxes in the truck before lunch. Jackson puts fourteen boxes in the truck before dinner. How many boxes are left for Jackson to put in the truck after dinner? Show all your mathematical thinking.

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More Challenging Version

Jackson's grandmother is moving to a new house. Grandmother has one hundred twenty boxes for Jackson to put in the truck! Jackson puts thirty-two boxes in the truck before breakfast. Jackson puts fifty-one boxes in the truck before lunch. Jackson puts thirty-one boxes in the truck before dinner. How many boxes are left for Jackson to put in the truck after dinner? Show all your mathematical thinking.

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Plan

Underlying Mathematical Concepts

  • Part/Whole relationships
  • Number sense to 120
  • Addition/Subtraction
  • Comparison

Possible Problem-Solving Strategies

  • Model (manipulatives)
  • Table
  • Diagram/Key
  • Number line
  • Place value strips

Formal Mathematical Language and Symbolic Notation

  • Model
  • Table
  • Diagram/Key
  • Number line
  • Place value strips
  • Total/Sum
  • Addition/Subtraction
  • Equation
  • Part/Whole
  • Odd/Even
  • Left/Right
  • Amount
  • Addend
  • Place value
  • Ones, tens
  • Most/Least
  • More than (>)/Greater than (>)/Less than (<)
  • Equivalent/Equal to

A student may independently select a printed number line, number chart, ten frames, graph paper, etc. as they work on a task.

Download printable resources for student representations.

Suggested Materials

Engagement Image:

Teachers may project the images below to launch this task for their students, define nouns, promote discussion, access prior knowledge, and inspire engagement and problem solving.

Click image to enlarge

Click image to enlarge

Task-Specific Evidence

This task requires students to use properties of operations and place value to add four numbers. Students will also be expected to use their understanding that the equal sign represents a relationship in which expressions on either side of the equal sign represent the same value(s).

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Printer-Friendly Exemplars Rubric

Possible Solutions

  • Task Solution (active tab)
  • More Accessible Solution
  • More Challenging Solution
Task Solution

Jackson has 6 boxes left to put in the truck.

More Accessible Solution

Jackson has 7 boxes left to put in the truck.

More Challenging Solution

Jackson has 6 boxes left to put in the truck.

Possible Connections

Below are some examples of mathematical connections. Your students may discover some that are not on this list.

  • The total number of boxes is an odd number.
  • If you have a missing addend, you can subtract to find it.
  • If you reverse the order of the same addends, you get the same sum.
  • If you move to the right on a number line — away from zero — you get larger numbers. If you move to the left — toward zero — you get smaller numbers.
  • Jackson loads 22 more boxes before lunch than before dinner.
  • 6 boxes are the least amount put in the truck.
  • Solve more than one way to verify the answer.
  • Relate to a similar task and state a math link.

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