## 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
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
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
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
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
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__________

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 _

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____

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_______

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___

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.
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.
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.
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

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

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

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,
My desk is about __80___ cm long.
My desk is about 80 cm long,

Explanation:
Estimated the length of my desk the width is

Question 3.
How does knowing that an unsharpened pencil is about
__________________________________________________________
__________________________________________________________
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

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
Whiteboard is 45 cm,

Explanation:
The best length of Whiteboard is 45 cm.

b. Banana                    14 cm or 30 cm
Banana is 14 cm,

Explanation:
The best length of Banana is 14 cm.

c. DVD                        25 cm or 17 cm
DVD is 17 cm,

Explanation:
The best length of DVD is 17 cm.

d. Pen                         16 cm or 1 m
Pen is 16 cm,

Explanation:
The best length of Pen is 16 cm.

e. Swimming pool      50 m or 150 cm
Swimming pool is 50 m,

Explanation:
The best length of Swimming pool is 50 m.

Question 3.
Measure the length of the lines using your pinky finger.
a. Line A _______________________
Line A is about ___12______ cm long.
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.
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.
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.