# Instructional Task: Grade 2

## Stuffed Animal Collection

### Task

Joe and Jane collect the same kinds of stuffed animals. Joe has forty-eight monkeys, twenty-five bears, and sixty-seven dogs. Jane looks at Joe's collection and says she has the same number of stuffed animals. Jane has thirty-four monkeys and fifty-eight bears. How many dogs does Jane have? Show all your mathematical thinking.

### Alternative Versions of Task

#### More Accessible Version

Joe and Jane collect the same kinds of stuffed animals. Joe has forty-two monkeys, twenty-one bears, and sixty-six dogs. Jane looks at Joe's collection and says she has the same number of stuffed animals. Jane has thirty-six monkeys and thirty-three bears. How many dogs does Jane have? Show all your mathematical thinking.

#### More Challenging Version

Joe and Jane collect the same kinds of stuffed animals. Joe has forty-eight monkeys, twenty-five bears, eighteen cats, and sixty-seven dogs. Jane looks at Joe's collection and says she has the same number of stuffed animals. Jane has thirty-four monkeys, fifty-eight bears, and twenty-eight cats. How many dogs does Jane have? Show all your mathematical thinking.

### Common Core Content Standards and Evidence

#### 2.NBT Number and Operations in Base Ten

*Use place value understanding and properties of operations to add and subtract.*

6. Add up to four two-digit numbers using strategies based on place value and properties of operations.

### Exemplars Task-Specific Evidence

This task requires students to use properties of operations and place value to add three two-digit numbers. Students are also 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).

### GO Math! Alignments

- Chapter 4, Lessons: 4.1, 4.2, 4.3, 4.4, 4.5, 4.11, 4.12

### Common Core Standards of Mathematical Practice

**MP.1** Make sense of problems and persevere in solving them.**MP.3** Construct viable arguments and critique the reasoning of others.**MP.4** Model with mathematics.**MP.6** Attend to precision.

### Underlying Mathematical Concepts

- Part/Whole reasoning
- Number sense to 140
- Addition/Subtraction
- Comparison

### Possible Problem-Solving Strategies

- Model (manipulatives)
- Table
- Number line

### Possible Mathematical Vocabulary/Symbolic Representation

- Model
- Table
- Diagram/Key
- Number line
- Total/Sum
- Part/Whole
- Odd/Even
- Left/Right
- Amount
- Difference
- Equation
- Addends
- Dozen
- More than (>)/Greater than (>)/Less than (<)
- Equivalent/Equal to

### Possible Solutions

Jane has 48 dogs.

#### More Accessible Version Solution

Jane has 60 dogs.

#### More Challenging Version Solution

Jane has 38 dogs.

### Possible Connections

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

- Together, Joe and Jane have 280 stuffed animals.
- 280 is double 140.
- Joe has an even number of monkeys, an odd number of bears and an odd number of dogs.
- Jane has an even number of monkeys, bears and dogs.
- If you reverse the order of the same addends, you get the same sum.
- 48 dogs is 4 dozen.
- Joe has 14 more monkeys than Jane.
- Jane has 33 more bears than Joe.
- Jane has 19 less dogs than Joe.
- Solve more than one way to verify the answer.
- Relate to a similar task and state a math link.