Multiplication Of Whole Numbers, Decimals, Squares And Square Roots Worksheet With Answers Page 7
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41Lesson 2
Pupil’s Book pages 91 and 92
Extension activity
Ask the pupils to find out the cost of six items in a
Preparation
shop or newspaper. They should then calculate the
You will need to have:
cost of five, ten, twenty and sixty of those items.
•
A flannel board (optional).
Starter activity
Homework activity
Pupils are to complete anything unfinished from
Revise counting forwards and backwards in 10s,
question 1 on page 26 of the WB.
starting at any multiple of 10 to 1 000. Then,
count forwards and backwards in 10s starting at
Ask pupils to complete the Challenge on
any other 2- or 3-digit number. Then, practise
page 91 of the PB.
multiplying mentally by 10, for example 34 × 10,
45 × 10, 560 ÷ 10 and 2 300 ÷ 10. Ask the pupils
Lesson 3
Pupil’s Book page 92; Workbook page 26
if they can see any pattern in the answers. Make
sure that they can see that the digits move one
Preparation
place to the left in multiplication (the units’ digit
You will need to have:
becomes the tens’ digit, the tens’ digit become the
•
Flash cards for the starter activity.
hundreds’ digit and so on).
Lesson focus
Starter activity
Read through the introductory text with your
Write ten decimal numbers on flashcards. Include
class. Go through the worked examples with them,
some numbers with a zero in the Units column
making sure that all your pupils are comfortable
and some with a zero in the Tenths column. Ask
with the multiplication of a decimal by 10 and
pupils to write each number in expanded form,
its multiples. Illustrate moving the decimal point
as an addition involving tens, units, tenths and
using a flannel board. Place a decimal number on
hundredths. For example, if you wrote 10.4, pupils
the board and ask a pupil to come up and move the
would write 10 + 0.4. Challenge pupils to write the
decimal point to show a multiplication by 10.
expanded numbers as quickly as they can. Briefly
go through the correct answers.
Pupils are to do Exercise 2 on pages 91 and 92 of
the PB.
Lesson focus
Answers
Read through the introductory text with the
class. Ensure the pupils understand the method of
Exercise 2
multiplying decimals and keeping the same number
1. a) 13; b) 56; c) 82; d) 110.4; e) 153.3;
of decimal places in their answers. Break each
f ) 201.6; g) 79.32; h) 123.8
multiplier up into tens and units and work each
2. 67.2 kg
out as a separate sum. Then bring them together.
3. N 8 037.90
Pupils to do Exercise 3 on page 92.
Challenge
10, 40, 6, 20, 60, 40
Answers
Exercise 3
Assessment
1. a) 131.1; b) 88.2; c) 116.64; d) 330.19
2. a) 86.4; b) 152.496; c) 1 099.9; d) 18 928;
Assess the pupils’ answers to Exercise 2 and
e) 6 497.5; f ) 11 827.2
ensure they can multiply any decimal by 10
3. 2 204.4 cm
and its multiples.
Workbook
2. 238 kg; 3. 36 cm, 96 cm; 4. 9 tins; 5. 1 426 mm
62
Unit 14: Multiplication of decimals
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