Truncating
I can estimate a value by truncating to a given degree of accuracy.
Truncating
I can estimate a value by truncating to a given degree of accuracy.
Lesson details
Key learning points
- When estimating ages, it is convention to use truncation.
- Truncation can be used to estimate any integer to a given accuracy.
- Truncation can be used to estimate any number to a given accuracy.
Common misconception
When truncating, pupils are tempted to round. Also, when truncating, they cut off the number without thinking about the magnitude.
The use of the place value table shows the magnitude of the number, thus preserving their place value when truncating.
Keywords
Truncate - Truncation is the simplifying a number by 'cutting off' one or more of the digits and replacing them with zeros if necessary to preserve place value.
A degree of accuracy - A degree of accuracy shows how precise a number or measurement is.
Licence
This content is © Oak National Academy Limited (2024), licensed on Open Government Licence version 3.0 except where otherwise stated. See Oak's terms & conditions (Collection 2).
Video
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Starter quiz
6 Questions
323 -
320 (2 s.f.)
294.82 -
294.8 (1 d.p.)
291 -
290 (2 s.f.)
294.829 -
294.83 (2 d.p.)
0.0038903 -
0.0039 (2 s.f.)
0.038903 -
0.04 (2 d.p.)
0.00038903 -
0.0004 (1 s.f.)
0.000038903 -
0.000039 (2 s.f.)
$${19.89} \over {0.498}$$ -
$$\approx 40$$
$${19.89} \over {0.2134}$$ -
$$\approx 100$$
$${19.89} \over {0.1111}$$ -
$$\approx 200$$
$${19.89} \over {2.073}$$ -
$$\approx 10$$
Exit quiz
6 Questions
46 347 823 -
40 000 000
4634 -
4000
46.347 -
40
46 347.823 -
40 000
4.634823 -
4
Exact answer is required -
A length of wood 37 m needs to be cut into 5 equal strips.
Rounded answer is required -
A meal is £37 and you share it between 5 people and want to give a tip
Truncated answer is required -
You have £37 and want to buy as many £5 puzzle cubes as possible.
INT(78/8) -
9
INT(90/8) -
11
INT(123/10) + INT(7.9/3) -
14
INT(789/10) + INT(56/3) -
96
INT(1.65/10) + INT(76.6/3) -
25
INT(8/0.5) + INT(12.65/2) − INT(9.8/6) -
21