In addition to capacity, we will learn how to add up the various units of capacity and volume. When adding, we must ensure that the capacity units, ie liters and milliliters, are converted into milliliters before the addition and then follow the simple addition process.

We get to know two different methods to solve the addition with the standard unit and the smaller capacity unit. Students can practice both methods.

**(I)** Adding units with conversion to Milliliters

**(ii)** Adding units without converting them to Milliliters

We can add two or more capacity units l and ml like ordinary numbers.

Elaborated examples for adding capacity and volume:

**1.** 3rd Add* l* 600* ml* and 6 *l* 300 *ml*

**Solution:**

**Method 1 **(with conversion to milliliters):

We know 1 liter = 1000 milliliters

Now liters (*l*) and milliliters (*ml*) are converted to *ml* before we do the addition, and then we have to follow the simple addition process.

3* l* 600* ml* = (3 × 1000) *ml* + 600 *ml* = 3000 *ml* + 600 *ml* = 3600 milliliters

6th *l* 300 *ml* = (6 × 1000) *ml* + 300 *ml* = 6000 *ml* + 300 *ml* = 6300 milliliters

Now add up

3600 **ml**

+ __ 6300__** ml**

__ 9900 ml__

= 9 *l* 900 *ml*

**So 3 l 600 ml + 6 l 300 ml = 9 l 900 ml **

**Method 2 **(without conversion to milliliters):

Here *l* and *ml* are arranged in different columns and then added up like ordinary numbers.

(I) *l *and *ml *are arranged in columns

(ii) 600 *ml *+ 300 *ml *= 900 *ml*

*(iii) 3 **l *+ 6 *l *= 9 *l*

**l ml**

3 600

+__ 6,300____ 9 900__

= 9 *l* 900 *ml*

**So the sum of 3 l 600 ml and 6 l 300 ml = 9 l 900 ml.**

**2.** 5. Add* l* 725* ml* and 8 *l* 450 *ml*

**Solution:**

**Method 1 **(with conversion to milliliters):

We know 1 liter = 1000 milliliters

Now liter (*l*) and milliliters (*ml*) are converted to *ml* before we do the addition, and then we have to follow the simple addition process.

5* l* 725* ml* = (5 × 1000) *ml* + 725 *ml* = 5000 *ml* + 725 *ml* = 5725 milliliters

8th *l* 450 *ml *= (8 × 1000) *ml* + 450 *ml* = 8000 *ml* + 450 *ml* = 8450 milliliters

Now add up

1

5725 **ml**

+__ 8450 __**ml**__ 14175 __**ml**

= 14 *l* 175 *ml*

**Therefore 5 l 725 ml + 8 l 450 ml = 14 l 175 ml **

**Method 2 **(without conversion to milliliters):

Here *l* and *ml* are arranged in different columns and then added up like ordinary numbers.

(I) *l *and *ml *are arranged in columns

(ii) 725* ml *+ 450* ml *= 1* l *175* ml.*175

*ml*is located under

*ml*. 1

*l*is recorded

*l*Pillar.

*(iii) **1 ** I + *5

*l*+ 8*l*= 14

*l*

** l**** ml**

1

5 725

+ __ 8 450____ 14 175__

= 14 *l* 175 *ml*

**Hence the sum of 5 l 725 ml and 8 l 450 ml = 14 l 175 ml.**

More solved examples of adding capacity where the method is mentioned in the given question.

**3rd** 17th Add* l*387* ml*, 7 *l* 750 *ml *and 9 *l *without conversion to milliliters

**Solution:**

Without conversion to milliliters here *l* and *ml* are arranged in different columns and then added up like ordinary numbers.

(I) *l *and *ml *are arranged in columns

(ii) 387* ml *+ 750* ml *= 1* l *137* ml.*137

*ml*is located under

*ml*. 1

*l*is recorded

*l*Pillar.

*(iii) **1 ** I + *17th

*l*+ 7*l*

*+ 9*

*l*= 34

*l*

** l ml**

21 1

17 387

7 750

+__ 9,000____ 34 137__

= 34 *l* 137 *ml*

**Hence the sum of 17 l 387 ml, 7 l 750 ml and 9 l = 34 l 137 ml.**

**4th** 13. Add* l*250* ml*, 8th *l* 750 *ml *and 6 *l *with conversion to milliliters

**Solution:**

With the conversion to milliliters, we carry out the addition process here.

We know 1 liter = 1000 milliliters

Now liters (*l*) and milliliters (*ml*) are converted to *ml* before we do the addition, and then we have to follow the simple addition process.

13* l* 250* ml* = (13 × 1000) *ml* + 250 *ml* = 13000 *ml* + 250 *ml* = 13250 milliliters

8th *l* 750 *ml *= (8 × 1000) *ml* + 750 *ml* = 8000 *ml* + 750 *ml* = 8750 milliliters

6th *l*= (6 × 1000) *ml* = 6000 milliliters

Now add up

111

13250 **ml**

8750 **ml**

+__ 6000 __**ml**__ 28000 __**ml**

= 28 *l* 000 *ml *

* = *28000 *ml*

**Therefore, ****13 l250 ml + 8 l 750 ml + 6th l = 28000 ml**

**5. Add 36 l 275 ml and 16 l 150 ml.**

Arrange the numbers vertically. First add the milliliters. 275 ml + 150 ml = 425 ml Add the liters 36 l + 16 l = 52 l |

So 36 l 275 ml + 16 l 150 ml = 52 l 425 ml

**6th** Add 150 l 810 ml and 90 l 300 ml

**Solution:**

Arrange the numbers vertically. First add the milliliters. 810 ml + 300 ml = 1110 ml = 1 l 110 ml Write 110 under the ml column and put 1 l on the liter column. Add the liters 150 l + 90 l + 1 = 241 l |

So 150 l 810 ml + 90 l 300 ml = 241 l 110 ml

Word problems with adding capacity and volume:

**7th** Finn bought 3* l* 250* ml* Milk on monday, 2 *l* 750 *ml *on Wednesday and 3 *l *500* ml *on Friday. How much milk did Finn buy in those three days?

**Solution:**

1 1

Milk bought on Monday = 3 *l* 250 *ml*

Milk bought on Wednesday = 2* l* 750* ml*

Milk bought on Friday = 3 *l* 500 *ml*__+__

Hence the total amount of milk bought during these 3 days = 9 *l* 500 *ml*

The above problems with adding capacity will help students practice the adding the various units worksheet with or without conversion.

Questions and answers about capacity expansion:

**I. Add the following:**

(i) 7 l 152 ml + 2 l 339 ml

(ii) 5 l 240 ml + 7 l 860 ml

(iii) 70 l 000 ml + 22 l 504 ml

(iv) 13 l 1290 ml + 18 l 160 ml

(v) 32 l 540 ml + 18 l + 210 ml

(vi) 19 l 300 ml + 3 l 900 ml

(vii) 62 l 200 ml + 15 ml 385 ml

(viii) 120 l + 625 ml + 30 l 750 ml

(ix) 21 l 845 ml + 32 l 116 ml + 38 l 082 ml

**Reply:**

**I.** (i) 9 L 491 ml

(ii) 13 l 100 ml

(iii) 92 l 504 ml

(iv) 31 L 450 ml

(v) 50 l 750 ml

(vi) 23 L 200 ml

(vii) 77 L 585 ml

(viii) 151 l 375 ml

(ix) 92 l 43 ml

● **Related concepts **

**● ****Standard unit of capacity**

**●**Conversion of the standard capacity unit

**● **Subtract the capacity

**Math worksheets for 3rd grade**

**3rd grade math class**

**From capacity expansion to HOMEPAGE**

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