Multiplication Of Whole Numbers, Decimals, Squares And Square Roots Worksheet With Answers Page 36
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41Unit 22
Adding and subtracting length
Objectives
By the end of this unit, each pupil should be able to:
•
Add and subtract lengths in centimetres and
•
Solve word problems on addition and
metres
subtraction of length.
•
Add and subtract lengths in metres and
kilometres
Suggested resources
it may be the correct one. Encourage your pupils
to draw a picture or a diagram that illustrates
Rulers with mm and cm markings on them; Metre
the problem, writing in the given lengths. Some
stick(s).
problems also lend themselves to role-play, which is
helpful as your pupils can act out the situation and
Frequently asked questions
‘experience’ what is happening.
Q What prior knowledge do the pupils need?
A Pupils should:
Pupils do the calculation but forget to answer the
•
have a good understanding of a standard unit
question that was posed. Read the problem with the
of measurement
class so that they have a clear understanding of what
•
be able to use a ruler
is required. Also remind them to always check what
•
be comfortable with basic addition and
was asked, once they have arrived at an answer.
subtraction methods
•
be able to multiply and divide with whole
Evaluation guide
numbers.
Pupils to:
1. Solve given problems on addition and
Common errors that pupils make
subtraction of lengths.
Pupils struggle to add and subtract lengths. It is
important to check that they know their basic number
Lesson 1
Pupil’s Book pages 137 and 138;
bonds (combinations). If they do not, you need to
Workbook page 37
give additional attention to this aspect of the work.
Preparation
Pupils often forget to write down the unit of
You will need to have:
measurement required in the answer. Point out
•
Place value columns drawn on the board for
to the pupils that this is necessary so that they
illustration.
do not forget with which units they are working.
Point out too, that this distinguishes working with
Starter activity
measurements and working with ordinary numbers.
Revise basic addition, subtraction, multiplication
Pupils choose the wrong calculation in word
and division skills. Set your pupils the questions
problems. Some pupils are reluctant readers and
below, and ask them to answer verbally or in
are unable to engage with the situation described
written form. Correct the answers and assess
in a word problem. As a result, they tend to
your pupils’ competence with the four arithmetic
choose an operation at random, in the hope that
operations.
91
Unit 22: Adding and subtracting length
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