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Decimal Place Rounding

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by

Mr Mattock

on 1 September 2018

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Transcript of Decimal Place Rounding

Decimal Place Rounding
Starter
What about Exactly halfway?
What digits can fill this space: 27.2...64 ?
L.O. - Round a number to a given number of decimal places.
The calculation on the
screen gives an answer of
1551.806452.

Round the answer to the nearest:
(a) 1000
(b) 100
(c) 10
Decimal places
1551
1552
1551.8
1551.9
Main Activity
Complete either the red, amber or green activity on the sheet.
Main Activity Answers
Red
Amber
Green
(a) 7.638, 8.2, 7.749, 8.463, 8.34, 7.86, 8.45, 7.5.
(b) 7.5, 7.638, 7.749, 7.86, 8.2, 8.43, 8.45, 8.463.
(c) 7.5 - No. (d) 8.463 - Yes (8.499999....)
(1) 5, 5, 6, 7, 3, 5, 7, 4, 4, 3 (2) 3.5, 6.5, 4.0, 4.5, 3.2

(3) 4.50, 3.18
(4) The maximum number of decimal places
any of the numbers have is 3 decimal places.
(a) 3.450 and anything up to 3.549.
(b) 5.750 and anything up to 5.849.
(c) 5.750 - 3.549 = 2.201. (d) 5.849 - 3.450 = 2.399
What about Exactly halfway?
What digits can fill this space: 27.2...64 ?
0, 1, 2, 3, 4 - Round down
5, 6, 7, 8, 9 - Round up
Decimal places
1551
1552
1551.8
1551.9
1551.80
1551.81
1551.806
1551.807
Starter
The calculation on the
screen gives an answer of
1551.806452.

Round the answer to the nearest:
(a) 1000 -
2000
(b) 100 -
1600
(c) 10 -
1550
Activities
Activity
Answers

Key
Examples

Main Activity
On your whiteboard show me the number lines that the given numbers are between (to the given accuracy).
Decimal places
Whole numbers
Tenths
Hundredths
Thousandths
1551.80
1551.81
1551.806
1551.807
Worked
Example
Part 1
Worked
Example
Part 2
Worked
Example
Full transcript