Standards-based assessment and Instruction

## Frogs and Flies

There is a frog sitting on a lily pad. First, the frog eats 5 flies. Next, the frog eats 5 flies. Last, the frog eats 5 flies. How many total flies does the frog eat? Show all your mathematical thinking.

#### More Accessible Version

There is a frog sitting on a lily pad. First, the frog eats 3 flies. Next, the frog eats 3 flies. Last, the frog eats 3 flies. How many total flies does the frog eat? Show all your mathematical thinking.

#### More Challenging Version

There is a frog sitting on a lily pad. First, the frog eats 8 flies. Next, the frog eats 8 flies. Last, the frog eats 8 flies. How many total flies does the frog eat? Show all your mathematical thinking.

### Common Core Content Standards and Evidence

#### 1.OA Operations and Algebraic Thinking

Represent and solve problems involving addition and subtraction.

2.   Solve word problems that call for addition of three whole numbers whose sum is less than or equal to 20, e.g., by using objects, drawings, and equations with a symbol for the unknown number to represent the problem.

This task requires students to solve word problems that require addition of three whole numbers and to add, combine and count on. Students must also have number sense to 15 and the ability to recognize duration (first, next, last).

### 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.
MP.7 Look for and make use of structure.

### Underlying Mathematical Concepts

• Number sense to 15
• First, next, last

### Possible Problem-Solving Strategies

• Model (manipulatives)
• Diagram/Key
• Tally Chart
• Table
• Number line

### Formal Mathematical Language and Symbolic Notation

• Model
• Diagram/Key
• Tally chart
• Table
• First, next, last
• More than (>)/Greater than (>)/Less than (<)
• Equivalent/Equal to
• Equal shares
• Odd/Even

### Possible Solutions

The frog eats a total of 15 flies.

#### More Accessible Version Solution

The frog eats a total of 9 flies.

#### More Challenging Version Solution

The frog eats a total of 24 flies.

### Possible Connections

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

• There is an equal amount of flies eaten each day.
• The frog ate an odd number of flies each day.
• Solve more than one way to verify the answer.
• An equation is 5 + 5 + 5 = 15
• 15 is an odd number answer.
• The frog does not eat any more flies, because the task uses the terms first, next, last.
• The running total is 5, 10, 15 flies, or Odd, Even, Odd flies.
• The running total is a +5 pattern.

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