All the solutions provided in **McGraw Hill My Math Grade 4 Answer Key PDF Chapter 12 Lesson 2 Metric Units of Capacity **will give you a clear idea of the concepts.

## McGraw-Hill My Math Grade 4 Answer Key Chapter 12 Lesson 2 Metric Units of Capacity

The amount of liquid a container can hold is its capacity. The liter (L) and milliliter (mL) are units of measurement for capacity in the metric system.

liter (L)

A bottle this size can hold a liter.

milliliter (mL)

An eyedropper holds about one milliliter.

**Math in My World**

**Example 1**

Decide whether 300 milliliters or 300 liters is the more reasonable estimate for the capacity of the mug.

Use logic to estimate the capacity.

So, ______________ is the more reasonable estimate.

Answer: So, 300 milliliters is the more reasonable estimate.

Explanation: Given the data,

Now, we will estimate the capacity of the mug.

The given estimated values are 300 milliliters or 300 liters which is the more reasonable estimate.

The 300 liters is larger. A mug is a small object. So, the best estimate is 300 milliliters.

Hence, the best estimated capacity of the mug is 300 milliliters.

**Example 2**

Decide whether 6 milliliters or 600 liters is the more reasonable estimate for the capacity of the swimming pool.

The pool is a large object. So, 600 milliliters is too small.

So, _____________ is the more reasonable estimate.

Answer: So, 600 liters is the more reasonable estimate.

Explanation: Given that figure

Now, we will estimate the capacity of the swimming pool.

Whether the 6 milliliters or 600 liters is the more reasonable estimate.

The 6 milliliters is too small. The pool is a large object. So, the best estimate is 600 liters.

Hence, the estimated capacity of the swimming pool is 600 liters.

**Talk Math**

Describe the unit of capacity you would use to measure the capacity of a bottle of medicine.

Answer: The amount of liquid medicine is often measured in fluid ounces. A unit equal to 8 fluid ounces. The capacity of a standard measuring cup is one cup.

**Guided Practice**

**Circle the more reasonable estimate for each capacity.**

Question 1.

1 mL

1 L

Answer: The estimated capacity of the bottle is 1 liter.

Explanation: Given the figure

Now, we will estimate the capacity of the bottle.

The given values are 1 mL and 1L which is the more reasonable estimate.

The 1 mL is very small. A bottle is a big object. So, the best estimate is 1 liter

Hence, the estimated capacity of the bottle is 1 L.

Question 2.

38 mL

38 L

Answer: The estimated capacity of the sink holder is 38 L.

Explanation: Given the figure

Now, we will estimate the capacity of the sink holder.

The given values are 38 mL and 38 L which is the more reasonable estimate.

The 38 mL is very small. A sink holder is a big object. So, the best estimate is 38 L.

Hence, the estimated capacity of the sink holder is 38 L.

Question 3.

220 mL

220 L

Answer: The estimated capacity of a liquid bottle is 220ml.

Explanation: Given the figure

Now, we will estimate the capacity of the liquid bottle.

The given values are 220 mL and 220 L which is the more reasonable estimate.

The 220 L is very large. A liquid bottle is a small object. So, the best estimate is 220mL.

Hence, the estimated capacity of the liquid bottle is 220 mL.

**Independent Practice**

**Circle the more reasonable estimate for each capacity.**

Question 4.

150 mL

150 L

Answer: The estimated capacity of the balloon is 150ml.

Explanation: Given the figure

Now, we will estimate the capacity of the balloon.

The given values are 150 mL and 150 L which is the more reasonable estimate.

The 150 L is very large. A ballon is a small object. So, the best estimate is 150 mL.

Hence, the estimated capacity of the balloon is 150 mL.

Question 5.

120 mL

120 L

Answer: The jar box contains 120ml.

Explanation: Given the figure

Now, we will estimate the capacity of the bottle.

The given values are 120 mL and 120 L which is the more reasonable estimate.

The 120 L is very large. A bottle is a small object. So, the best estimate is 120 mL.

Hence, the estimated capacity of the bottle is 120 mL.

Question 6.

500 mL

500 L

Answer: The estimated capacity of the given bottle is 500ml.

Explanation: Given the figure

Now, we will estimate the capacity of the bottle.

The given values are 500 mL and 500L which is the more reasonable estimate.

The 500 L is very large. A bottle is a small object. So, the best estimate is 500 mL.

Hence, the estimated capacity of the bottle is 500 mL.

Question 7.

700 mL

700 L

Answer: The estimated capacity of the sauce bottle is 700ml.

Explanation: Given the figure

Now, we will estimate the capacity of the sauce bottle.

The given values are 700 mL and 700 L which is the more reasonable estimate.

The 700 mL is very large. A sauce bottle is a small object. So, the best estimate is 700 mL.

Hence, the estimated capacity of the bottle is 700 mL.

Question 8

1 mL

1 L

Answer: The estimated capacity of the coffee mug is 1liter.

Explanation: Given the figure

Now, we will estimate the capacity of the mug.

The given values are 1 mL and 1L which is the more reasonable estimate.

The 1 mL is very small. A mug is a big object. So, the best estimate is 1 liter

Hence, the estimated capacity of the bottle is 1 L.

Question 9.

30 mL

30 L

Answer: The estimated capacity of the aquarium is 30 liters.

Explanation: Given the figure

Now, we will estimate the capacity of the bottle.

The given values are 30 mL and 30 L which is the more reasonable estimate.

The 30 mL is very small. An aquarium is a big object. So, the best estimate is 30 liters.

Hence, the estimated capacity of the bottle is 30 L.

Question 10.

Select three containers. Decide whether each container has a capacity that is greater than, less than, or equal to 1 liter. Complete the table.

Answer: The table for three containers that are less than 1 liter, Greater than 1 liter, and Equal to 1 liter is,

**Problem Solving**

Question 11.

**Mathematical PRACTICE** Reason Jenna said that she took 4 milliliters of medicine when she was sick. Is this a reasonable statement? Explain.

Answer: Yes, her statement is reasonable. Usually, medicines are taken in small amounts.

Question 12.

Jonah said he drank 3 liters of water after his soccer game. Is this a reasonable statement? Explain.

Answer: No, his statement is not reasonable. 3 liters of water is about 12 glasses of water, which is too much for a person to drink at one time.

**HOT Problems**

Question 13.

**Mathematical PRACTICE** Model Math Think of three objects in your house that can hold more than 1 liter. List them.

Answer: The three objects in our house that can hold more than 1 liter is Bucket, a Big cooking pot, Water Bottle.

Question 14.

**Mathematical PRACTICE** Plan Your Solution Suppose you have a 4-liter bucket and a 7-liter bucket. You need 5 liters of water for an aquarium. Explain how to get 5 liters of water if neither bucket is marked.

Answer: First, fill the 4-liter bucket and pour it into the 7-liter bucket. Next, fill the 4-liter bucket again and pour enough to fill the 7-liter bucket. Empty the 7-liter bucket and pour the remaining 1 liter from the 4-liter bucket. Fill the 4-liter bucket once more and pour it into the 7-liter bucket.

Question 15.

**Building on the Essential Question** How is measuring capacity with the metric system similar to measuring capacity with the customary system? How is it different?

Answer: In the Customary system of measurement, we measure liquids using cups, pints, ounces, gallons, etc. In the Metric System of measurement, we measure capacity using two different measures, liters and milliliters. Both systems find the amount of liquid a container can hold, but each system uses different units of measurement.

### McGraw Hill My Math Grade 4 Chapter 12 Lesson 2 My Homework Answer Key

**Practice**

**Choose the most reasonable estimate for each capacity.**

Question 1.

(A) 40 liters

(B) 4 liters

(C) 40 milliliters

(D) 4 milliliters

Answer: Option D

Explanation: Given that,

Now, we will estimate the capacity of a spoon.

Based on the given option, option (D) 4 milliliters is correct.

Because 40 milliliters,4 liters, and 40 liters are very high.

So, the estimated capacity is 4 milliliters.

Question 2.

(A) 10 mL

(B) 100 mL

(C) 10 L

(D) 100 L

Answer: Option C

Explanation: Given that,

Now, we will estimate the capacity of a Bucket

Based on the given option, option (C) 10 liters is correct.

Because 10 milliliters and 100 ml are very less, 100 liters are very high.

So, the estimated capacity is 10 liters.

Question 3.

(A) 1 liter

(B) 3 liters

(C) 7 liters

(D) 10 liters

Answer: Option A

Explanation: Given that,

Now, we will estimate the capacity of a bottle.

Based on the given option, option (A) 1liter is correct.

Because 3liters, 7 liters, and 10 liters are very high compared to 1 liter.

So, the estimated capacity of the bottle is 1liter.

Question 4.

(A) 17 mL

(B) 170 mL

(C) 170 L

(D) 17 L

Answer: Option A

Explanation: Given that,

Now, we will estimate the capacity of a Tea Cup.

Based on the given option, option (A) 17 milliliters is correct.

Because 170 milliliters, 170 liters, and 17 liters are high compared to 17ml.

So, the estimated capacity is 17 milliliters.

Match each object to its reasonable capacity.

**Problem Solving**

Question 8.

**Mathematical PRACTICE** Check for Reasonableness Emerson needs to use eye drops. Is it reasonable for her to put 1 milliliter of drops in each eye? Explain.

Answer: Emerson needs to use eye drops. yes, it is reasonable for her to put 1milliliter of drops in each eye. We do need to put 1ml of eye drops in each eye because that is how much we need, and we know that is right because we use 1ml every time we use eye drops.

Question 9.

Ryan fills his cat’s water bowl. Is it reasonable to say he uses 1 milliliter of water? Explain.

Answer: It’s not reasonable to say he uses 1 milliliter of water. Because 1 milliliter = 0.033 oz of water is much too less to fill a bowl.

Question 10.

Identify 2 objects you could find in a grocery store that hold less than 100 milliliters.

Answer: The two objects in a grocery store that hold less than 100 milliliters is Food essence and toothpaste.

**Vocabulary Check **

Write a vocabulary term to complete each sentence.

liters

milliliters

Question 11.

The capacity of a baby’s bottle would be measured in ______________.

Answer: The capacity of a baby’s bottle would be measured in Milliliters.

Question 12.

The capacity of a fish tank would be measured in ______________.

Answer: The capacity of a fish tank would be measured in Liters.

**Test Practice**

Question 13.

Which is a reasonable estimate for the capacity of a bottle of mouthwash?

(A) 1 milliliter

(B) 20 milliliters

(C) 1 liter

(D) 20 liters

Answer: Option B

Explanation: Given that,

Now, we will estimate the capacity of a bottle of mouthwash.

Based on the given option, option (B) 20 milliliters is correct.

Because 1 milliliter is very less, 1 liter and 20 liters are very high.

So, the estimated capacity is 20 milliliters.