Bigger Units to Smaller Units

To convert a bigger unit a smaller unit, we move the decimal point of the right. In other words, we can say that we multiply. This is very important for us to learn how to convert bigger units into smaller units. We use it often in our daily life.

Measurement of length, mass and capacity tables can be represented in the form of a place-value chart as shown below.

Metric Conversion Table

I: Converting Larger Units of Length into Smaller Units of Length:

Conversion of higher units into lower units::

1. Convert 22 cm into mm.

Solution:

We know that 1 cm = 10 mm

                   22 cm = 22 × 10 mm

                             = 220 mm


2. Convert 17 cm 8 mm into mm.

Solution:

17 cm 8 mm = 17 cm + 8 mm

We know that 1 cm = 10 mm

17 cm + 8 mm = 17 × 10 mm + 8 mm

                       = 170 mm + 8 mm

                       = 178 mm


3. Convert 5 km into meters.                                                                                                                                                                          Solution:

We know that 1 km = 1000 m

                     5 km = 5 × 1000 m

                             = 5000 m


4. Convert 9 km 248 m into meters.

Solution:

9 km 248 m = 9 km + 248 m

We know that 1 km = 1000 m

9 km + 248 m = 9 × 1000 m + 248 m

                      = 9000 m + 248 m

                      = 9248 m


5. Convert 4 meters into decimeters.

Solution:

We know that 1 m = 10 dm

                     4 m = 4 × 10 dm

                            = 40 dm


Conversion of higher units into lower units:

(Make use of the above table)

6. Convert 53 km to (i) hectometre  (ii) decametre  (iii) metre

(i) 1 kilometre = 10 hectometres

  53 km          = 53 × 10 hectometres

                     = 530 hectometres


(ii) 1 kilometre = 10 × 10 decametres

53 km              = 53 × 100 decametres

                       = 5300 decametres


(iii) 1 kilometre = 10 × 10 × 10 metres

53 km               = 53 × 1000 metres

                        = 53000 metres


II: Converting Bigger Units of Mass into Smaller Units of mass:

To convert kilogram into grams and grams into milligrams, we multiply by 1000.

For example:

1. Convert 5 g into mg.

We know that 1 g = 1000 mg

5 g = 5 × 1000 mg

      = 5000 mg 


2. Express 5 kg 350 g as g.

We know that 1 kg = 1000 g

So, 5 kg = 5 × 1000 g

             = 5000 g 

5 kg 350 g = 5000 g + 350 g

                = 5300 g


3. Convert 61 hectograms to centigrams

1 hg = 10 × 10 × 10 × 10 cg

       = 10000 cg

Therefore, 61 hg = 61 × 10000 cg

                         = 610000 cg


4. Convert 6 quintals to kilograms.

1 quintal = 100 kg

6 quintals = 6 × 100 kg

               = 600 kg


5. Convert 7 tonnes to (i) quintals (ii) kilograms

(i) 1 tonne = 10 quintals

7 tonnes = 7 × 10

             = 70 quintals

(ii) 1 tonne = 1000 kg

7 tonnes = 7 × 1000

             = 7000 kg


IV: Converting Bigger Units of Capacity into Smaller Units of Capacity:

To convert liters into milliliters, we multiply the number of liters by 1000.

For example:

1. Express 54 l into ml.

We know that 1 l = 1000 ml

Hence, 54 l = 54 × 1000 ml

                 = 54000 ml


2. Express 29 l 360 ml into ml.

We know that 1 l = 1000 ml

Hence, 29 l 360 ml = 29 × 1000 ml + 360 ml

                            = 29000 ml + 360 ml

                            = 29360 ml


3. Convert 1.54 decalitres to centilitres

1 dal = 10 × 10 × 10 cl

        = 1000 cl

Therefore, 1.54 dal = 1.54 × 1000 cl

                             = 1540 cl


Note: When a higher unit is changed into a lower unit, we multiply the number of the higher unit by the number showing the relationship between the two units.


Solved examples for the conversion of bigger units to smaller units:

1. Convert 723.469 kilograms into the following units:

(i) hectograms

(ii) decagrams

(iii) grams

(iv) decigrams

(v) centigrams

(vi) milligrams


Solution:

(i) 723.469 kg = (723.469 × 10) hg = 7234.69 hg

(ii) 723.469 kg = (723.469 × 100) dag = 72346.9 dag

(iii) 723.469 kg = (723.469 × 1000) g = 723469 g

(iv) 723.469 kg = (723.469 × 10000) dg = 7234690 dg

(v) 723.469 kg = (723.469 × 100000) cg = 72346900 cg

(vi) 723.469 kg = (723.469 × 1000000) mg = 723469000 mg


Let us consider another example involving different types of conversions.

2. Convert the following:

(i) 8 m 6 dm 3 cm 2 mm to mm

(ii) 2 kg 4 hg 6 dag 8 g to g

(iii) 7 l 1 dl 4 cl 9 ml to ml

Solution:

(i) 8 m 6 dm 3 cm 2 mm to mm

= (8 × 1000 + 6 × 100 + 3 × 10 + 2) mm, [Because 1 m = 1000 mm, 1 dm = 100 mm and 1 cm = 10 mm]

= (8000 + 600 + 30 + 2) mm

= 8632 mm

 

(ii) 2 kg 4 hg 6 dag 8 g to g

= (2 × 1000 + 4 × 100 + 6 × 10 + 8) g, [Because 1 kg = 1000 g, 1 dg = 100 g and 1 dag = 10 g]

= (2000 + 400 + 60 + 8) g

= 2468 g

 

(iii) 7 l 1 dl 4 cl 9 ml to ml

= (7 × 1000 + 1 × 100 + 4 × 10 + 9) ml, [Because 1 l = 1000 ml, 1 dl = 100 ml and 1 cl = 10 ml]

= (7000 + 100 + 40 + 9) g

= 7149 ml


3. Convert 9 m 8 dm into decimeters.

Solution:

9 m 8 dm = 9 m + 8 dm

We know that 1 m = 10 dm

9 m + 8 dm = 9 × 10 dm + 8 dm                       

                  = 90 dm + 8 dm

                  = 98 dm


Questions and Answers on Bigger Units to Smaller Units:

I. Convert the given lengths from cm to mm:

(i) 6 cm = ………….. mm

(ii) 35 cm = ………….. mm

(iii) 12 cm = ………….. mm

(iv) 62 cm = ………….. mm

(v) 20 cm = ………….. mm

(vi) 102 cm = ………….. mm

(vii) 23 cm = ………….. mm

(viii) 150 cm = ………….. mm

Bigger Units to Smaller Units

Answers:

I. (i) 60 mm

(ii) 350 mm

(iii) 120 mm

(iv) 620 mm

(v) 200 mm

(vi) 1020 mm

(vii) 230 mm

(viii) 1500 mm





4th Grade Math Activities

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