Multiplication Of Whole Numbers, Decimals, Squares And Square Roots Worksheet With Answers Page 19
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41Workbook
Answers
2. a) 300; b) 800; c) 6 500; d) 100; e) 6 400; f) 300
Exercise 3
1. a) 6; b) 63; c) 12; d) 101
Assessment
2. a) 235; b) 86; c) 72; d) 409; e) 107; f ) 81;
g) 21; h) 40
Pupils should be able to round whole numbers
to the nearest hundred with and without a
Workbook
number line. Observe responses of the pupils
3. a) 3; b) 13; c) 2; d) 97; e) 1; f ) 5
as they round whole numbers to the nearest
hundred. Look at their answers to Exercise 2.
Assessment
Homework activity
Pupils should be able to find the estimates
Pupils are to complete question 2 on page 29 of
of decimal numbers to the nearest whole
the WB.
numbers. Observe the pupils’ responses during
the lesson. Look at their answers to Exercise 3.
Lesson 3
Pupil’s Book pages 110 and 111;
Extension activity
Workbook page 29
Ask pupils to round off some numbers with two
decimal places to the nearest whole number.
Preparation
You will need to have:
Homework activity
•
A wall chart with a straight line, as shown in
Pupils are to complete question 3 on page 29 of
the Suggested resources.
the WB.
Starter activity
Ask the pupils to draw a number line in their
Lesson 4
Pupil’s Book pages 111 and 112;
books. Let them mark 0 to 9 and locate 4.5 on the
Workbook pages 29 and 30
number line. Repeat this activity with some other
decimal numbers on the number line e.g. 2.5, 5.5,
Preparation
8.5, and so on.
You will need to have:
•
Multiplication tables to refer to, if necessary.
Lesson focus
Lead the pupils to understand that 0.5 is the midpoint
Starter activity
of each pair of numbers on the number line such
Write two different numbers on the board and ask
that between 5 and 6, the midpoint is 5.5 etc. If a
the pupils to add them together. Repeat the activity
number is below this midpoint it is estimated down
with some other numbers. Make sure you time the
but if it falls above the midpoint, it is estimated up.
pupils when working the sums. Let the pupils find
For example, 2.3 is estimated to 2 (down) but 2.8
the differences in the pairs of numbers written on
is estimated to 3 (up) to the nearest whole number.
the board.
Show this relationship on the number line.
Now ask the pupils to find an estimate of each of
the pairs of numbers written on the board to the
2
2.3
2.5
2.8
3
nearest 10 or 100 as the case may be. Correct the
Go through the worked examples in the PB. Ask
pupils where necessary. Lead the pupils to discover
them to do Exercise 3.
that whole numbers can also be approximated to
the nearest number, for example:
67 = 70 (to the nearest 10)
74
Unit 17: Estimation
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