## Engage NY Eureka Math 2nd Grade Module 2 Lesson 5 Answer Key

### Eureka Math Grade 2 Module 2 Lesson 5 Problem Set Answer Key

First, estimate the length of each line in centimeters using mental benchmarks.

Then, measure each line with a centimeter ruler to find the actual length.

Question 1.

_____________________________________

a. Estimate: __7____ cm

b. Actual length: __ 8____ cm

Answer:

a. Estimate: __7____ cm,

b. Actual length: __ 8____ cm,

Explanation:

First, estimated the length of each line in centimeters using

mental benchmarks.

Then, measured each line with a centimeter ruler to find

the actual length so a. Estimate: __7____ cm,

b. Actual length: __ 8____ cm.

Question 2.

_____________________________________

a. Estimate: __20____ cm

b. Actual length: __15____ cm

Answer:

a. Estimate: __20___ cm,

b. Actual length: __ 15__ cm,

Explanation:

First, estimated the length of each line in centimeters using

mental benchmarks.

Then, measured each line with a centimeter ruler to find

the actual length so a. Estimate: __20_ cm,

b. Actual length: __15__ cm.

Question 3.

_____________________________________

a. Estimate: __13___ cm

b. Actual length: ___11___ cm

Answer:

a. Estimate: __13____ cm,

b. Actual length: __ 11____ cm,

Explanation:

First, estimated the length of each line in centimeters using

mental benchmarks.

Then, measured each line with a centimeter ruler to find

the actual length so a. Estimate: __13___ cm,

b. Actual length: __ 11__ cm.

Question 4.

_____________________________________

a. Estimate: __6___ cm

b. Actual length: ___8___ cm

Answer:

a. Estimate: __6___ cm,

b. Actual length: __ 8___ cm,

Explanation:

First, estimated the length of each line in centimeters using

mental benchmarks.

Then, measured each line with a centimeter ruler to find

the actual length so a. Estimate: __6__ cm,

b. Actual length: __ 8__ cm.

Question 5.

_____________________________________

a. Estimate: ___6___ cm

b. Actual length: ___5___ cm

Answer:

a. Estimate: __6__ cm,

b. Actual length: __5__ cm,

Explanation:

First, estimated the length of each line in centimeters using

mental benchmarks.

Then, measured each line with a centimeter ruler to find

the actual length so a. Estimate: __6__ cm,

b. Actual length: __5__ cm.

Question 6.

Circle the correct unit of measurement for each length estimate.

a. The height of a door is about 2 (centimeters/meters) tall.

What benchmark did you use to estimate? _____2 meters__________

Answer:

Explanation:

If we measure the height off the door in centimeres the

value will be very big, So the appropriate and easy measure

is meters. Therefore the height of a door is about 2 meters tall.

b. The length of a pen is about 10 (centimeters/meters) long.

What benchmark did you use to estimate? _10 centimeters _

Answer:

Explanation:

If we use meters as our benchmark the value will be very small

so the appropriate value to measure is centimeters.

Therefore the length of a pen is about 10 centimeters long.

c. The length of a car is about 4 (centimeters/meters) long.

What benchmark did you use to estimate? ______4__meters____

Answer:

Explanation:

If we measure the length of the car in centimeters the value

will be very big, so it is approriate to use meters as our measure.

Therefore the length of a car is about 4 meters long.

d. The length of a bed is about 2 (centimeters/meters) long.

What benchmark did you use to estimate? _____2 meters_______

Answer:

Explanation:

If we use centimeters as our benchmark the value will be very

small so the appropriate value to measure is meters. Therefore

the length of a bed is about 2 meters long.

e. The length of a dinner plate is about 20 (centimeters/meters) long.

What benchmark did you use to estimate? ___20 centimeters___

Answer:

Explanation:

If we use meters as our benchmark the value will be very small

so the appropriate value to measure is centimeters.

Therefore the length of a dinner plate is about 20 centimeters long.

Question 7.

Use an unsharpened pencil to estimate the length of 3 things in your desk.

a. _______Pencil Box______ is about __25__ cm long.

Answer:

Pencil Box is about 25 cm long,

Explanation:

The estimated length of Pencil Box is about 25 cm long.

b. ______Crayon Box______ is about ___10___ cm long.

Answer:

Crayon Box is about 10 cm long,

Explanation:

The estimated length of Crayon Box is about 10 cm long.

c. ______Eraser______________ is about ___3____ cm long.

Answer:

Eraser is about 3 cm long,

Explanation:

The estimated length of Eraser is about 3 cm long.

### Eureka Math Grade 2 Module 2 Lesson 5 Exit Ticket Answer Key

Question 1.

Circle the most reasonable estimate for each object.

a. Length of a push pin 1 cm or 1 m

Answer:

Length of a push pin is 1 cm,

Explanation:

Circled the most reasonable estimate for

length of a push pin is 1 cm.

b. Length of a classroom door 100 cm or 2 m

Answer:

Length of a classroom door is 2m,

Explanation:

Circled the most reasonable estimate for

length of a classroom door is 2m,

c. Length of a pair of student scissors 17 cm or 42 cm

Answer:

Length of a pair of student scissors 17 cm,

Explanation:

Circled the most reasonable estimate for

length of apair of student scissors 17 cm.

Question 2.

Estimate the length of your desk. (Remember,

the width of your pinky is about 1 cm.)

My desk is about __80___ cm long.

Answer:

My desk is about 80 cm long,

Explanation:

Estimated the length of my desk the width is

about 80 cm long.

Question 3.

How does knowing that an unsharpened pencil is about

20 cm long help you estimate the length of your arm from

your elbow to your wrist?

__________________________________________________________

__________________________________________________________

Answer:

Estimating the length of my arm from my elbow to my wrist is 60 cm,

Explanation:

By measuring and estimating the length of my arm from my

elbow to my wrist is 60 cm.

### Eureka Math Grade 2 Module 2 Lesson 5 Homework Answer Key

Question 1.

Name five things in your home that you would measure in meters.

Estimate their length.

Remember, the length from a doorknob to the floor is about 1 meter.

Item | Estimated Length |

a. Sofa | 1 meter |

b. Fridge | 2 meters |

c. Alimarah | 1 meter |

d. Study Table | 1 meter |

e. Entrance Door | 2 meters |

Answer:

a. Sofa – 1 meter,

b. Fridge – 2 meters,

c. Alimarah – 1 meter,

d. Study Table – 1 meter,

e. Entrance Door – 2 meters,

Explanation:

Named five things in my home that would measure in meters.

Estimated their lengths as

a. Sofa – 1 meter,

b. Fridge – 2 meters,

c. Alimarah – 1 meter,

d. Study Table – 1 meter,

e. Entrance Door – 2 meters.

Question 2.

Choose the best length estimate for each object.

a. Whiteboard 3 m or 45 cm

Answer:

Whiteboard is 45 cm,

Explanation:

The best length of Whiteboard is 45 cm.

b. Banana 14 cm or 30 cm

Answer:

Banana is 14 cm,

Explanation:

The best length of Banana is 14 cm.

c. DVD 25 cm or 17 cm

Answer:

DVD is 17 cm,

Explanation:

The best length of DVD is 17 cm.

d. Pen 16 cm or 1 m

Answer:

Pen is 16 cm,

Explanation:

The best length of Pen is 16 cm.

e. Swimming pool 50 m or 150 cm

Answer:

Swimming pool is 50 m,

Explanation:

The best length of Swimming pool is 50 m.

Question 3.

The width of your pinky finger is about 1 cm.

Measure the length of the lines using your pinky finger.

Write your estimate.

a. Line A _______________________

Line A is about ___12______ cm long.

Answer:

Line A is about 12 cm long,

Explanation:

The estimate of Line A is about 12 cm long.

b. Line B ____

Line B is about ____2_____ cm long.

Answer:

Line B is about 2 cm long,

Explanation:

The estimate of Line B is about 2 cm long.

c. Line C ___________________________________________

Line C is about _____20____ cm long.

Answer:

Line C is about 20 cm long,

Explanation:

The estimate of Line C is about 20 cm long.

d. Line D __________________________________

Line D is about ____15_____ cm long.

Answer:

Line D is about 15 cm long,

Explanation:

The estimate of Line D is about 15 cm long.

e. Line E _______________

Line E is about ____5_____ cm long.

Answer:

Line E is about 5 cm long,

Explanation:

The estimate of Line A is about 5 cm long.