Multiplication Of Whole Numbers, Decimals, Squares And Square Roots Worksheet With Answers Page 22
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41Unit 18
Open sentences
Objectives
By the end of this unit, each pupil should be able to:
•
Define an open sentence
•
Solve related quantitative reasoning
•
Find a missing number in an open sentence
problems.
Suggested resources
Lesson 1
Pupil’s Book pages 114 and 115;
Workbook page 31
Chart containing worked examples on open
sentences; Flashcards showing open sentences and
Preparation
balancing scales showing balancing equations.
You will need to have:
Key word definitions
•
Flashcards showing open sentences
•
Balancing scales showing balancing equations.
inverse: opposite
Starter activity
Frequently asked questions
Before you start this lesson, ask the pupils what
Q What prior knowledge do the pupils need?
must be added to 6 to get 10. Try this activity with
A Pupils need to understand addition and
many other addition facts, for example, facts to 20:
subtraction facts very well. They should be able
14 + 6 =20 therefore, 20 – 6 = 14.
to multiply and divide simple numbers. Pupils
are to remember that division is the inverse of
Revise how to balance scales learnt in Primary 2.
multiplication and vice versa.
Ten fish will balance a scale to the same level but
only four have been put on the scale, how many
Common errors that pupils make
fish need to be put on the scale for it to balance.
Pupils find it difficult to see that shapes represent
Make the lesson as practical as possible.
unknown numbers. Write down the missing
numbers on card and place them over the shapes
Lesson focus
in the number sentence so that pupils can see how
Explain the meaning of open sentences and relate it
it works.
to the scale balance introduced earlier.
Evaluation guide
Lead pupils to understand the different symbols
Pupils to:
used in representing unknowns, such as rectangular
1. Solve given problems on open sentences
box, triangular box and circular box. Alphabets are
involving the four basic operations.
also used to represent unknowns. Lead them to
2. Find missing numbers in quantitative aptitude
determine the unknowns in the given examples.
diagrams drawn from open sentences.
Guide them through the examples and ask them to
3. Solve some problems of quantitative aptitude
answer Exercise 1.
involving open sentences.
77
Unit 18: Open sentences
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