4.3 Time

Mathematics

Grade 5

Measurement and time

Module 54

Time

Activity 1:

To solve problems that include calculating and converting appropriate time units [LO 4.2]

1. COMPETITION TIME!

In this activity your general knowledge will be tested. Let us see who can answer first – the boys or the girls! Each correct answer is worth 2 points. Points will be subtracted if learners shout out.

1.1 How many months are there in a year?

1.2 Which months have only 30 days?

1.3 Which months have 31 days?

1.4 How many days are there in a year?

1.5 How many days are there in a leap year?

1.6 How many days does February have in a leap year?

1.7 How many days are there in a school week?

1.8 How many seconds are there in a minute?

1.9 How many minutes are there in an hour?

1.10 How many hours are there in a day?

1.11 How many weeks are there in a year?

1.12 How many minutes are there in quarter of an hour?

1.13 How many seconds are there in three-quarters of a minute?

1.14 How many days does December have in a leap year?

Who won?

BRAIN-TEASERS!

• How many years are there in a decade?
• What is a millennium?
• What is another word for a time period of 100 years?
• Some people use v.a.e. and a.e. instead of BC (Before Christ) and AD (Anno Domini). What do they mean?

DID YOU KNOW?

We use the Christian calendar that began with the birth of Jesus. The names of the months originated from Roman times.E.g. August is named after the Roman emperor, Augustus Caesar, who lived form 27 BC to 14 AD.

Activity 2:

To describe and illustrate the way in which time is represented in different cultures [LO 4.4]

1. CHALLENGE: SOME “RESEARCH” FOR YOUR PORTFOLIO!

Let us do some research into how time is indicated in other cultures. Ask your teacher for the paper you will need to work on.

• See whether you can find a Jewish or Muslim calendar.
• Compare it to our calendar and make a list of the differences and similarities.
• Tell your classmates how they differ, and in what way they are similar.
• Give it to your teacher for assessment.
• Exhibit it in the classroom for all to see.
• Remember to file it neatly in your portfolio.

REMEMBER THESE ABBREVIATIONS

seconds : s

minutes : min

hour : h

day : d

week : wk

month : mo

year : a

DID YOU KNOW?

The symbol for hour (h), comes from the Latin word “hora” that means “hour”.

The symbol for year was originally “a”. This comes form the Latin word “annus”, which means “year”.

Activity 3:

To use measuring instruments, including stop-watches, to measure time accurately [LO 4.3]

1. What is a stop-watch?

2. Work together with a friend and complete the table, using a stop-watch.