# Know Your Numbers: Estimating Numbers

In this worksheet, students answer a selection of mixed questions in which they must use estimation.

Key stage:  KS 2

Curriculum topic:   Number: Number and Place Value

Curriculum subtopic:   Represent Numbers to 1000

Difficulty level:

### QUESTION 1 of 10

When we estimate, we do not carry out exact calculations.

We work things out ROUGHLY.

7 is roughly 10

48 is roughly 50.

389 is roughly 400.

Examples

The Battle of Hastings in 1066 was roughly 1000 years ago.

960 grams is roughly 1 kilogram.

Six 18 cm long pencils placed end to end will stretch roughly 1 metre in length.

Choose the right words to complete this sentence.

28 eggs are ______________ to fill an egg box that holds 30 eggs.

enough

not enough

Choose the right words to complete this sentence.

(Tick all the answers that fit)

298 is ______________ 300.

not the same as

the same as

roughly

equal to

approximately

Choose the number which is closest to 58.

50

60

Tom pours lemonade from six 330 ml cans into a jug.

Roughly how much lemonade is in the jug?

1 litre

2 litres

3 litres

Sam needs 400 ml of paint to paint a table.

How much paint should he buy to paint 4 tables?

Remember that there are 1000 ml in a litre.

1½ litres

2 litres

2½ litres

There are 296 beans in a jar.

Estimate how many beans there are in 2 jars.

400

500

600

When I run 10 metres, I usually take 5 paces.

Estimate how many paces I take when I run 100 metres.

50

500

150

A fish finger weighs 48 grams.

Estimate how much a box of 10 fish fingers weighs.

50 g

500 g

5 kg

A tube of smarties holds 38 smarties.

Estimate how many smarties there will be in 10 tubes.

400

300

200

A toothbrush factory makes roughly 4 toothbrushes every minute.

Estimate how many toothbrushes will be made in 20 minutes.

50

100

200

• Question 1

Choose the right words to complete this sentence.

28 eggs are ______________ to fill an egg box that holds 30 eggs.

not enough
EDDIE SAYS
28 eggs will not fill every space in the egg box.
• Question 2

Choose the right words to complete this sentence.

(Tick all the answers that fit)

298 is ______________ 300.

not the same as
roughly
approximately
• Question 3

Choose the number which is closest to 58.

60
• Question 4

Tom pours lemonade from six 330 ml cans into a jug.

Roughly how much lemonade is in the jug?

2 litres
EDDIE SAYS
3 cans hold 990 ml which is roughly 1 litre, so 6 cans is roughly 2 litres.
• Question 5

Sam needs 400 ml of paint to paint a table.

How much paint should he buy to paint 4 tables?

Remember that there are 1000 ml in a litre.

2 litres
EDDIE SAYS
To paint 4 tables, Sam will need 1600 ml of paint, which is 1.6 litres. 1½ litres will not be enough and 2½ litres will be too much, so 2 litres is the best option.
• Question 6

There are 296 beans in a jar.

Estimate how many beans there are in 2 jars.

600
EDDIE SAYS
Two jars contains 592 beans, which is roughly 600.
• Question 7

When I run 10 metres, I usually take 5 paces.

Estimate how many paces I take when I run 100 metres.

50
EDDIE SAYS
5 x 10 = 50.
• Question 8

A fish finger weighs 48 grams.

Estimate how much a box of 10 fish fingers weighs.

500 g
EDDIE SAYS
48 x 10 = 480, which is roughly 500 g.
• Question 9

A tube of smarties holds 38 smarties.

Estimate how many smarties there will be in 10 tubes.

400
EDDIE SAYS
38 x 10 = 380, which is roughly 400.
• Question 10

A toothbrush factory makes roughly 4 toothbrushes every minute.

Estimate how many toothbrushes will be made in 20 minutes.

100
EDDIE SAYS
4 x 20 = 80, which is roughly 100.
---- OR ----

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