Mathematics Form 1 Notes Pdf

LENGTH

Length is the distance between two points along a straight line. Length can be measured in mm, cm, m or km.

1 cm = 10 mm

1 m = 100 cm

1 km = 1000 m

MASS

Mass is the amount of matter in an object.Mass can be measured in mg, g, kg or tonne.

1 g = 1000 mg

1 kg = 1000 g

1 tonne/tan = 1000 kg

TIME

Time is the period between two events. Time can be measured in seconds, minutes, hours, days, weeks, months, years, ...

Example :

a) The time spent in school from 7.15 in the morning to 4.40 in the afternoon.

b) The time from the beginning of the school term holidays to the end of the holidays.

1 minute = 60 seconds

1 hour = 60 minutes

1 day = 24 hours

1 week = 7 days

1 year = 12 months / 52 weeks / 365 days

1 century = 100 years

1 decade = 10 years

12 hour / 24 hour system

Exercise :

a) journey from your hostel to the class.

b) a football match.

c) singing of the National Anthem during the assembly.

The 12-Hour and the 24-Hour System

The 12 - Hour System

We read and write the times of the day as shown in the table below.

Written Time	Read As	Meaning
12.30 a.m.	twelve thirty or half past twelve	thirty minutes past twelve o'clock or thirty minutes to one o'clock
4.15 p.m.	four fifteen or quarter past four	fifteen minutes past four o'clock or forty-five minutes to five o'clock
10.50 p.m.	ten fifty	fifty minutes past ten o'clock or ten minutes to eleven o'clock

The 24 - Hour System

We read and write the times of the day as shown in the table below.