Measurement of Length Mass and Volume-Mathematics STD 4

Measurement of Length Mass and Volume-Mathematics STD 4

Length is the distance between two points. The standard unit of length is metre (m) Other units of length are:

• Kilometres (km).
• Hectometre (hk)
• Decametre (dam)
• Decimetre (dm)
• Centimetre (cm)
• Millimetre (mm)

Comparison of units of length:

Look at the table below showing the comparison of units of length.

To remember the arrangement of units in the table above Use the following sentences

KING HENRY DAUĞHTER MUST DRINK COLD MILK

(k)

(h)

(d)

(m)

(d)

(c)

(m)

From the table above 1km = 1,000m

Im = 100cm 1cm = 10mm

I. Changing metres (m) into centimetres (cm)

Changing centimetres (cm) into metres (m)

Changing centimetres (cm) into metres and centimetres

EXERCISE

1. Change the following into centirnetres

3m

9m

10m – 2m

15m + 18m + 2m

2. Change the following into metres

100cm

(700 – 500)cm

(500 x 6)cm

900cm

(80 x 40)cm

1500cm

300cm

100cm

(7+13 + 80 + 100 + 200)cm

(600 – 4500)cm

3. Change the following into centimetres and metres.

125cm

175cm

508cm

970cm

475cm

(20 + 50 + 200)cm

(380 + 70)cm

192cm

271 cm

(250-4) cm

Changing centimetre into millimetres

EXERCISE

Change the following into millimetres (mm)

1.	60cm
2.	54cm
3.	3. 305cm
4.	45em
5.	120cm
6.	8cm
7.	95cm
8.	26cm
9.	350cm
1)	10.10cm

Changing kilometres (km) into metres (m)

Note: 1km = 1000m

EXERCISE

Change the following into metres (m)

1.	16km
1.	2.4km 206m
2.	5 km,
3.	38km
4.	5.23km
5.	30km

6. 109km

7. 8km 54m

8. 99km 100m

9. 3km 509m

Changing metres (m) into kilometres (km) Examples

Change into km or km and m

1. 8, 000m
2. 7,530m
3. 12,008m
4. 1,803m
5. 5,673m
6. 9,500m
7. 7,000m
8. 10,005m
9. 15,000m
10. 9,003m

Self evaluation

1. 1km is equal to cm
2. The standard unit of length is
3. Use your ruler to measure the length of your mathematics textbook
4. List down two (2) tools used to measure length
5. 1,000mm is equal to metres
6. Change 3,000cm into dam
7. hm stands for
8. I dm is equal to
9. 1cm is equal to mm
10. 1km is equal to mm

MEASUREMENT OF MASS AND VOLUME

MASS

The commonly units of mass are kilogram and grams Other units of mass are:

• Tonne (t)
• Hectogram (hg)
• Decagram (dag)
• Decigram (dg)
• Centigram (cg)
• Milligram (mg)

Comparison of the units of mass

Exercise

changing grams (g) into kilogram (kg) and grams (g)

EXERCISE;

Change into kg and g.

EXAMPLES