Standards-based assessment and Instruction

## Dinosaur Books

Derek loves to collect books about dinosaurs. Derek has seven dinosaur books. Derek wants to have ten dinosaur books. Derek says he needs to collect two more dinosaur books. Is Derek correct? Show and tell how you know.

#### More Accessible Version

Derek loves to collect books about dinosaurs. Derek has two dinosaur books. Derek wants to have five dinosaur books. Derek says he needs to collect two more dinosaur books. Is Derek correct? Show and tell how you know.

#### More Challenging Version

Derek loves to collect books about dinosaurs. Derek has seventeen dinosaur books. Derek wants to have twenty dinosaur books. Derek says he needs to collect two more dinosaur books. Is Derek correct? Show and tell how you know.

### Common Core Content Standards and Evidence

#### K.OA Operations and Algebraic Thinking

Understand addition as putting together and adding to, and understand subtraction as taking apart and taking from.

4.   For any number from 1 to 9, find the number that makes 10 when added to the given number, e.g., by using objects or drawings, and record the answer with a drawing or equation.

This task requires students to find the number that makes 10 when added to seven. Students also need to compare two numbers.

### GO Math! Alignments

• Chapter 4, Lesson: 4.3
• Chapter 5, Lesson: 5.5

### 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.5 Use appropriate tools strategically.
MP.6 Attend to precision.

### Underlying Mathematical Concepts

• Number sense to 10
• Counting back/Subtraction
• Comparison

### Possible Problem-Solving Strategies

• Model (manipulatives)
• Diagram/Key
• Tally chart
• Number line

### Possible Mathematical Vocabulary/Symbolic Representation

• Model
• Diagram/Key
• Tally chart
• Number line
• Total/Sum
• Odd/Even
• More than (>)/Greater than (>)/Less than (<)
• Equivalent/Equal to
• Equation

### Possible Solutions

No, Derek is not correct.

#### More Accessible Version Solution

No, Derek is not correct.

#### More Challenging Version Solution

No, Derek is not correct.

### Possible Connections

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

• Derek needs to collect 1 more book to have 10.
• 7 + 2 = 9, which is an odd number. 10 is an even number.
• Solve more than one way to verify the answer.
• Use subtraction to support addition.
• Derek has to collect less books than he already has.
• Equations: 10 – 7 = 3 / 7 + ? = 10.

Our teacher-friendly tasks are designed to support both the Common Core and Citywide instructional expectations. GO Math! alignments are also available.
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