Multiplication Of Whole Numbers, Decimals, Squares And Square Roots Worksheet With Answers
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41Multiplication of whole numbers
Unit 13
Objectives
By the end of this unit, each pupil should be able to:
•
Multiply a whole number by 2-digit
•
Solve quantitative reasoning problems
numbers
multiplying whole numbers.
Suggested resources
to do and in what order. You could talk through
a problem with the pupils, making notes as you
2 ten-sided dice; 0 to 9 digit cards; Optional blank
go. Remind pupils that they need not follow your
place value charts showing Th H T U . t h; A set of
working layout exactly, but they should write down
large triangle times table cards (see Lesson 2 of this
whatever they think will help them remember
Unit); Three or more six-sided dice; A soft ball or
things, such as what they have already worked out
other soft object suitable for throwing; A timer
and what they need to do next.
Wall chart of 20 × 20 squares; A set of about two
dozen large cards showing 2-digit whole numbers
Evaluation guide
on one side and the corresponding multiple of ten
Pupils to:
on the other.
1. Multiply whole numbers by 2-digit numbers
Key word definitions
not exceeding 50.
2. Solve quantitative aptitude problems involving
multiplicand: the number being multiplied
multiplication of whole numbers by 2-digit
multiplier: the number used to multiply another
numbers not exceeding 50.
number by
suffixed: to put on the end of
Lesson 1
Pupil’s Book page 82
Common errors that pupils make
Preparation
Pupils use and apply the correct method, but make
You will need to have:
errors in calculations due to poor knowledge of
•
Ten multiplication questions written on the
times table facts. See Lesson 1.
board using 2-digit whole numbers.
Pupils have problems keeping track of their
calculations, especially when multiplying 3-digit
Starter activity
numbers. Teach these pupils the grid method of
Ask pupils to solve the multiplication questions
setting out multiplication.
you have written on the board. Give them five
For example, set out 256 × 30 like this:
minutes to complete as many questions as they
256 × 30 = 256 × 3 × 10
can. After the time is up, check how many
256 × 3 = (200 + 50+ 6) × 3
questions the pupils answered correctly. This will
= 600 + 150 + 18 = 768
help you identify how strong your pupils are with
768 × 10 = 7 680
multiplication.
Pupils make errors due to losing track of
Watch out for pupils multiplying the two multiples
calculations in a problem that requires several steps.
of ten incorrectly. To overcome this problem, teach
Encourage pupils to show their working to help
pupils the following method and give them lots of
them keep track of what calculations they need
56
Unit 13: Multiplication of whole numbers
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