L1 Numeracy Workbook Answers - Skills Workshop, 2011 Page 31
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32L1 Numeracy work book
N1/L1.9 Use estimation to find appropriate solutions to problems.
Name_____________________
Often you will need to round numbers in calculations with decimals. This is done to
speed up or facilitate a calculation when you only need a rough idea (an estimate) of
the answer.
E.g. you want to buy 18 first‐class stamps at £0.43 each. How could you make this
simpler to give you a “rough guide” to how much this will be?
20 x 40: 2x 4= 8 +00 = £8.00 rough answer
18 x £0.43= £7.74 exactly.
Now try the following:
Your car journey to work is 6.2 miles each way.
How many miles, approximately will you travel to work over 5
days, there and back?
6 miles x 2 journeys x 5 days = 60 miles
You buy a round of drinks: J2O £2.32, Fosters Extra Cold £2.89 x
2, red wine (small) £3.05.
Do a rough calculation to estimate the total cost.
£2 + £3 x 2 + £3 = £11
A parent buys two pairs of shoes at £2.79 and two pullovers at £4.25.
How much is this approximately?
£3 + 2 x £4 = £11
October 2011. Answers kindly contributed by Kevin Melling and Judith White, Somerset Skills & Learning. Workbook written and contributed
by Simon Kelsey, Steps to Work. September 2011. Search for Simon, Kevin and Judith on
Adult Numeracy and Functional Maths. For related resources visit the download page for this resource at skillsworkshop
Page 31 of 32
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