Multiplication Of Whole Numbers, Decimals, Squares And Square Roots Worksheet With Answers Page 32
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41Unit 21
Estimating and measuring length
Objectives
By the end of this unit, each pupil should be able to:
•
Make estimates of lengths in metres and
•
Compare estimates with actual
centimetres
measurements
•
Estimate distances in kilometres
•
Add and subtract lengths.
Suggested resources
Common errors that pupils make
Rulers with mm and cm markings on them; Metre
Pupils don’t know how to use a ruler, tape measure
stick(s); Pieces of card cut in strips one metre long;
or metre stick to measure. Ensure they know that
Objects your pupils can measure for their length
they must start measuring from the 0 mark. Point
(books, pieces of wood, rectangular boxes); Pieces of
out to them that in most cases they should not
string; wool and tape ready to help the pupils measure
measure from the edge of the ruler, tape measure or
in different ways; Ruler on the cover of the book;
metre stick. (You will need to check tape measures
Pieces of card cut to lengths of 10, 20 and 39 cm.
as some have a metal fitting at the ends to protect
the measuring tape and because of this the tape
Key word definitions
does start at 0 from the very edge.)
length: how long something is
Evaluation guide
width: how wide something is
Pupils to:
Frequently asked questions
1. Estimate given length and distances.
2. Estimate given objects and distances.
Q Why do some pupils not have a clear idea of how
3. Compare estimates and actual measurement.
long a metre is?
A Pupils often do not have a clear idea of how
Lesson 1
Pupil’s Book pages 131 and 132;
long a metre is because they have never worked
Workbook page 35 and 36
with a metre stick or a tape measure. If you
see that this is the case, ensure that you do
Preparation
a lot of practical work with metre sticks and
You will need to have:
tape measures. Let them cut a strip of paper
•
Rulers
a metre long and use it to measure as many
•
Tape measure
objects as possible. Get them to close their eyes
•
Metre stick
and visualise the length of their metre strip.
•
String or wool to be used as non-standard units
Encourage them to use their hands to show
of length.
the approximate length of a metre. You should
adopt a similar approach, should pupils not
Starter activity
have a good idea of the length of a centimetre.
Help them to cut off a 1 cm piece of string or
Start the work in this unit by talking about
wool. Ask them to compare it to their metre
different ways of measuring. Explain that in
strip and let them talk about the difference in
much of the world today the metric system is the
length. Ask them once more to visualise the
generally accepted way of measuring.
centimetre next to the metre.
87
Unit 21: Estimating and measuring length
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