Numeracy Worksheet - Castlebrae Community High School - 2012 Page 22
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47FHS Numeracy
Estimation : Calculation
contents page
Using rounded numbers in calculations to check an answer
allows us to judge whether our answer is sensible or not.
Example 1
Tickets for a concert were sold over 4 days. The number of tickets
sold each day was recorded in the table below.
Level 2
How many tickets were sold in total?
Monday
Tuesday
Wednesday Thursday
486
205
197
321
Estimate:
500 + 200 + 200 + 300
= 1200
Calculate:
486
205
197
+ 321
1209
Answer = 1209 tickets
(reasonable when compared to estimate).
Example 2
A bar of chocolate weighs 42g. There are 48 bars of chocolate in a
box. What is the total weight of chocolate in the box?
Level 3
Estimate = 50 x 40 = 2000g
42
Calculate:
x48
336
1680
2016
Answer = 2016g
(reasonable when compared to estimate).
22
L Watson 2012
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