PRIMARY CARIBBEAN 2024 online version (18 Mar) - Catalog - Page 15
MATHEMATICS
Look inside
What I have learned and
practice questions
Explanations and examples
Term 1 September Chapter 2
Term 2 Unit 1 Chapter 11
What is a set?
What I have learned
Make a mind map to show the following information about ratio:
●
What is a ratio? Give some examples.
●
In what ways can you write or describe a ratio?
●
What do you know about equivalent ratios? How do you make an equivalent ratio?
●
How can you simplify a ratio? How do you know a ratio is in its simplest form?
●
What is the difference between ratio and proportion? Give examples.
●
Explain how you can share set of objects in a given ratio, for example, sweets in the
ratio 4 : 3.
Any group or collection is a set.
You can make sets of
objects or sets of shapes.
The things that belong to
the set are called members.
This is a set of toy cars.
Each car is a member of the set.
1
Practice questions
Each set has lost one member. Draw a line to the missing member.
1 Write a ratio to compare the quantities in each statement.
a In Jamaica there is one teacher for every 35 students.
b To cook rice, you use 3 cups of water for each cup of rice.
c Jayden is twice as tall as his younger brother.
2 Look at the shapes from A to D.
a What fraction of each shape is blue?
b What fraction of each shape is red?
c What is the ratio of blue parts to red parts in each shape?
a
A
B
b
D
C
c
3 Simplify these ratios.
a 2 : 50
b 10 : 100 : 50
d
14
186
Extensive problem-solving
Term 1 December Chapter 10
Problem solving
Drawing a picture
Problem-solving strategies
You have already learned some strategies for solving problems.
•
Look for the necessary and unnecessary data.
•
Identify missing data.
•
Decide whether to add, subtract, multiply or divide.
•
Use rounding to estimate.
Drawing
a picture can be a
useful problem-solving
strategy.
Other strategies that can help you solve problems are:
•
find a pattern
•
make a list
•
guess-and-check
•
draw a picture.
Look at how Delroy and Ginelle worked on this problem.
Question: A square goat pen has four posts on each side. How many posts
are there?
Ginelle:
4
Delroy:
The
+2
+2
pen has 16 posts.
Algebra
sides.
A square has 4
4 + 4 + 4 + 4 = 16
Zorgews have 4 eyes. Yableys have 2 eyes. Draw zorgews, yableys or
combinations of both so that there is a total of 16 eyes in each box.
4 + 4 + 2 + 2 = 12
The pen has
12 posts.
Zorgews
Yableys
4
Discuss with a partner.
1
•
How do you know that Delroy’s answer is incorrect?
•
What strategy did Ginelle use to help her?
A different square goat pen is made using a total of 8 posts. How many posts
are there on each side? Do a drawing to help you work it out.
135
Return to the contents page
136
ANY QUESTIONS?
Talk to your local consultant:
hoddereducation.com/contact-us
13
