We included **HMH Into Math Grade 2 Answer Key PDF** **Module 19 Lesson 1 Estimate Lengths Using Centimeters **to make students experts in learning maths.

## HMH Into Math Grade 2 Module 19 Lesson 1 Answer Key Estimate Lengths Using Centimeters

I Can use an object with a known length to estimate the length of another object.

**Spark Your Learning**

Find an object that Marco could fit in a pencil box. Then find an object that would not fit in a pencil box.

A _____________ can fit in Marco’s pencil box.

A _____________ cannot fit in Marco’s pencil box.

Marco wants to find objects with a length of 10 unit cubes or fewer to fit in a pencil box. Give each pair of children 10 unit cubes and a piece of string. Have children line up 10 unit cubes. How does the length of these 10 unit cubes help you find what can fit in Marco’s pencil box? How can you use the string? Allow time for children to search the classroom and look for objects.

Answer:

A sharpener can fit in Marco’s pencil box.

A paint kit cannot fit in Marco’s pencil box.

**Build Understanding**

Question 1.

Roma finds some paper clips to measure, but she doesn’t have any rulers. She only has unit cubes. How can you measure paper clips with unit cubes?

A. About how many unit cubes long ¡s the paper clip?

_________ unit cubes

Answer:

3 unit cubes

Connect to Vocabulary

A unit cube has a length of 1 centimeter.

1 centimeter

B. About how many centimeters long is the paper clip?

___________ centimeters

Answer:

3 centimeters

1 unit cube = 1 centimeter

C. Look around your classroom for an object that ¡s about 3 centimeters long. Draw the object.

Answer:

Eraser is about 3 centimeters long.

**Turn and Talk** How does knowing the length of the unit cube help you estimate the length of the paper clip?

Answer:

1 cube = 3 centimeters

By seeing the 3 unit cubes estimated as 3 centimeters.

**Step It Out**

Question 1.

Use the length of the yarn to estimate the length of the pen.

A. Is the pen longer or shorter than the yarn?

The pen is ____________ than the yarn.

Answer:

The pen is longer than the yarn.

B. The yarn is _________ centimeters long. Which is the better estimate for the length of the pen?

about 6 centimeters

about 10 centimeters

Answer:

about 10 centimeters

The yarn is 5 centimeters long

as it is 5 unit cubes.

Explanation:

**Check Understanding**

Question 1.

The yarn is 4 centimeters long. Which is the best estimate for the length of the eraser?

about 3 centimeters

about 8 centimeters

about 15 centimeters

Answer:

about 8 centimeters

Explanation:

As the yarn is 4 centimeters long

and the eraser is double to it

4 + 4 = 8

**On Your Own**

Question 2.

**Reason** Alicia measures ribbon for a project, but she doesn’t have any rulers or unit cubes. She knows the pen is 10 centimeters long. Which is the best estimate for the length of the ribbon?

about 5 centimeters

about 10 centimeters

about 15 centimeters

Answer:

The ribbon is 15 centimeters long.

As the pen is 10 centimeters it is 5 more centimeters than the pen.

Question 3.

**Attend to Precision** About how long is Matt’s toy car? Estimate.

about _________ centimeters

Answer:

Explanation:

Matt’s toy car is about 5 centimeters long

1 unit cube = 1 centimeter

so, 5 unit cubes = 5 centimeters.

**I’m in a Learning Mindset!**

Was I able to finish my work? What helps me stay on task?

Answer:

yes, Concentration on the work helps to me finish the task.