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Making Predictions from Best-Fit Lines SAB • Grade 3 • Unit 12 • Lesson 3

Treasure MapGrace and Nicholasmade this map toshow where thetreasure was on theocean fl oor.

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Making Predictions from Best-Fit Lines SAB • Grade 3 • Unit 12 • Lesson 3

You will need the treasure map, the map scale, and a ruler to solve these problems.

1. Draw a line on the treasure map from the anchor through the heavyobjects. Use a ruler to draw a line as close to the points as possible.All of the points may not be on your line but they should be near theline you draw.

2. Complete the table with the coordinates for each of the objects on thetreasure map.

3. A. When Grace and Nicholas were searching for the Ghost Galleon,they found some heavy chains. They found the chains 75 feet tothe right and 170 feet to the front of the anchor. Mark a point onthe map to show where they found the chains. Label the point onthe map.

B. Does this point fall close to your best-fit line? Explain your answer.

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SAB • Grade 3 • Unit 12 • Lesson 3 Making Predictions from Best-Fit Lines

4. A. How far is it from the anchor to the cannon on the map?

B. How far is it from the anchor to the cannon on the sea floor?Show or tell how you found your answer.

5. A. Grace and Nicholas found the Ghost Galleon at the edge of thisgrid. Use your line to predict where they found the treasure. Mark and label this point on the map.

B. What are the coordinates for the point you marked?

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Treasure MapFeedback Box Expectation Check In Comments

Solve a multiplication problem involving measurement. [Q# 4B] E3

Plot points and fi nd objects on a map. [Q# 2–3, 5] E4

Measure to the nearest centimeter. [Q# 4A] E5

Draw a best-fi t line. [Q# 1] E9

Make predictions using a best-fi t line. [Q# 5] E11

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