Multiplication Of Whole Numbers, Decimals, Squares And Square Roots Worksheet With Answers Page 6
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41Unit 14
Multiplication of decimals
Objectives
By the end of this unit, each pupil should be able to:
•
Multiply decimals by 2-digit whole numbers
•
Solve quantitative reasoning problems
involving multiplication of decimals.
Suggested resources
× 4 double and double again
× 5 halve and multiply by 10
Flash cards; Multiplication charts; Quantitative
(for example 5 × 24 = 12 × 10 = 120)
aptitude chart; A flannel board.
Also practise multiplying decimals that are less than
Key word definitions
1, for example 0.5 × 6. Explain that they are simply
product: the answer to two numbers being multiplied
using their knowledge of multiplication facts and
of place value.
Common errors that pupils make
Lesson focus
Pupils forget the decimal point or put it in the wrong
place. Remind the pupils to use approximation to
This lesson shows the pupils how to use short
work out where the decimal point should be and to
multiplication to multiply decimals by single-digit
count the decimal places in the question.
numbers. Ask the pupils to complete Exercise 1 on
page 91 in the PB.
The pupils make multiplication errors. Help them
to learn the times table to 10 × 10.
Answers
Evaluation guide
Exercise 1
Pupils to:
1. a) 4.8; b) 0.56; c) 75.6; d) 73.6; e) 13.6;
1. Multiply decimals by 2-digit numbers.
f ) 12.99; g) 36.64; h) 6.3
2. Solve quantitative aptitude problems involving
Workbook
multiplication of decimal numbers by 2-digit
1. a) 75; b) 155; c) 270; d) 55; e) 504; f ) 900;
numbers.
g) 364; h) 432; i) 750; j) 2 304; k) 2 940;
l) 5 400
Lesson 1
Pupil’s Book pages 90 and 91;
Workbook page 26
Assessment
Preparation
Pupils should be able to multiply decimals by
You will need to have:
single-digit numbers.
•
Prepared flashcards for decimal multiplication.
Starter activity
Extension activity
Ask the pupils to find out the cost of six items in
Pupils should practise mentally multiplying
a shop or newspaper. They should then calculate
decimals by 2, 3, 4 and 5. Explain each strategy in
the cost of four and five of those items.
turn, and give them several examples to do before
moving on to the next one.
Homework activity
× 2 double the number
Pupils are to do question 1 on page 26 of the WB.
× 3 double and add original number
(for example 3 × 24 = 48 + 24 = 72)
61
Unit 14: Multiplication of decimals
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