Rounding And Estimating Worksheet Page 11
ADVERTISEMENT
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18MEP Y8 Practice Book A
6.
Write the number 8.645712 correct to:
(a)
3 decimal places
(b)
4 decimal places
(c)
1 decimal place.
7.
Write the number 147.52 correct to:
(a)
4 significant figures,
(b)
3 significant figures,
(c)
2 significant figures,
(d)
1 significant figure.
8.
Write the number 104.735 correct to:
(a)
the nearest whole number,
(b)
2 decimal places,
(c)
2 significant figures,
(d)
1 decimal place,
(e)
1 significant figure.
9.
Write each of the numbers below correct to 3 significant figures:
(a)
18.47
(b)
0.003265
(c)
147 300
(d)
62.999
(e)
0.036247
(f)
0.00036945
10.
A student completes the table
0.047
4 significant figures
opposite, but puts the accuracy
0.003
2 significant figures
statements against the wrong
numbers.
16.22
3 significant figures
Copy the table and put the
184 200
2 decimal places
statements against the numbers
so that every pairing is correct.
7.06
3 decimal places
4.6 Estimating
We can estimate the answers to calculations by rounding all the numbers sensibly.
We often round to just one significant figure. However, depending on the numbers
involved in the calculation, it may be better to round sensibly than to one
significant figure.
÷
÷
For example,
33 78 17 24
.
.
is roughly
34
17
, when the numbers are rounded
sensibly, giving a simple estimate for the answer of 2.
Example 1
A box of chocolates costs £2.72.
Estimate the total cost of 4 boxes of chocolates.
Solution
= 4
× .
(a)
Cost (£)
2 72
= 4
×
Estimate
3
=
£12
73
ADVERTISEMENT
0 votes
Related Articles
Related forms
Related Categories
Parent category: Education