Lesson 6 Compare Reptile Lengths in Story Problems

    • Let’s solve story problems about reptile lengths.

Warm-up Number Talk: Fives and Tens

Find the value of each expression mentally.

Activity 1 Whose Pet is Longer?

Problem 1

Lin’s pet lizard is 62 cm long. It is 19 cm shorter than Jada’s. How long is Jada’s pet lizard?

  1. Whose pet is longer?

  2. Circle the diagram that matches the story. 

    1. Diagram. Two rectangles of equal length. Top rectangle labeled Jada's pet, partitioned into two parts. First part, shaded, total length, question mark. Second part has a dashed outline, total length, 19. Bottom rectangle, labeled Lins pet, shaded, total length, 62.
    2. Diagram. Two rectangles of equal length. Top rectangle labeled Lins pet, partitioned into two parts. First part, shaded, total length 62. Second part has a dashed outline, total length, 19. Bottom rectangle labeled Jadas pet, shaded, total length, question mark.
  3. Solve. Show your thinking.

    Jada’s pet lizard is cm long.

Problem 2

Diego and Mai have pet snakes. Mai’s snake is 17 cm longer than Diego’s. Mai’s snake is 71 cm. How long is Diego’s pet snake?

  1. Whose pet is shorter?

  2. Circle the diagram that matches the story.

    1. Diagram. Two rectangles of equal length. Top rectangle labeled Diegos pet, partitioned into two parts. First part, shaded, total length, question mark. Second part has a dashed outline, total length, 17. Bottom rectangle, labeled Mais pet, shaded, total length, 71
    2. Diagram. Two rectangles of equal length. Top rectangle labeled Mai's pet, partitioned into 2 parts. First part shaded, total length, 71. Second part has dashed outline, total length, 17.  Bottom rectangle, shaded, labeled Diego's pet, total length, question mark.
  3. Solve. Show your thinking.

    Diego’s pet snake is cm long.

Activity 2 Guess My Reptiles

Partner A’s reptiles

Partner B’s reptiles

day gecko, 28 cm

Reptile, day gecko with line beneath for measuring.

ribbon snake, 83 cm

Reptile, Ribbon snake.

komodo dragon, 98 cm

Reptile, komodo dragon.

gila monster, 55 cm

Reptile, Gila monster.

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baby cobra, 46 cm

Reptile, Baby cobra snake.

baby alligator, 71 cm

Reptile, Baby alligator.

iguana, 65 cm

Reptile, Iguana.

ringneck snake, 38 cm

Reptile, Ringneck snake with line beneath for measuring.
  1. Choose one reptile from your list and one reptile from your partner’s list.

  2. Fill in the blanks to create a story problem using the lengths of the reptiles you picked. Then share your sentences with your partner.

    My reptile is cm long.

    It is cm (shorter/longer) than one of your reptiles.

  3. Which reptiles did your partner pick? Show your thinking.

Practice Problem

Problem 1

Andre’s snake is 85 centimeters long. His lizard is 28 centimeters long. How many centimeters longer is Andre’s snake than his lizard? Show your thinking.