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There are 100 one penny pieces in a pound.

Decimal Numbers (Year 4)

Decimals are used every day in KS2 Maths. They help pupils work with money, measurements, and more, making numbers easier to understand in real-life problems.

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Fascinating Fact:

Supermarkets use decimals in prices, so something that costs £2.49 is two pounds and forty nine pence.

In KS2 Maths, decimals are introduced as a way to show numbers smaller than one whole. Pupils learn how decimals link to fractions and money in everyday life.

Key Terms

Decimal: A number that uses a point to separate whole numbers from fractional parts.
Tenth: One part when something is divided into ten equal sections.
Hundredth: One part when something is divided into one hundred equal sections.

Frequently Asked Questions (Click to see answers)

What are decimals in KS2 Maths?

Decimals are numbers with a decimal point. They show values smaller than one, such as 0.5 for a half or 0.25 for a quarter.

How are decimals used with money?

Decimals are used in money to show pounds and pence. For example, £3.75 means three pounds and seventy five pence.

How do decimals and fractions link together?

Fractions and decimals are two ways of showing parts of a whole. For example, 0.5 is the same as one half, and 0.25 is the same as one quarter.

Try These Related Quizzes

1 .

Which is the smallest?

1.7

0.9

2.1

0.3

³?₁₀ is less than ⁹?₁₀

2 .

What is £19.42 rounded to the nearest £?

£18

£19

£19.50

£20

We round down numbers less than .5 and we round up numbers equal to or higher than .5

3 .

How is 4.3 changed to 4.7?

Add 0.5

Subtract 0.4

Add 0.4

Divide by 0.4

Just like 43 + 4 = 47,
4.3 + 0.4 = 4.7

4 .

What is 345p in £s?

£3.45

£345

£0.345

£34.5

There are 100 pence in £1 so we divide 345 by 100 which gives 3.45 or £3 and 45p

5 .

What does the digit 4 represent in 3.4?

4 tenths

4 tens

4 ones

4 hundredths

Tenths are the column after the decimal point

6 .

Which is the largest?

2.9

3.4

4.3

0.8

All the other numbers have less than 4 ones

7 .

How is 0.8 changed to 0.2?

Add 0.6

Subtract 0.6

Subtract 6

Add 6

Just like 8 - 6 = 2
0.8 - 0.6 = 0.2

8 .

What is the figure 7 worth in 1.7?

7 ones

7 hundredths

7 tenths

7 tens

A number 7 in the tenths column means ⁷?₁₀

9 .

What is 423cm in metres?

423m

42.3m

4.23m

0.423m

There are 100cm in a metre. Therefore 423cm is 4m and 23cm or 4.23m

10 .

Which is the decimal fraction equivalent to thirty two and five tenths?

3.25

32.5

0.325

325

Whole numbers are on the left of the decimal point

You can find more about this topic by visiting BBC Bitesize - What are decimals?

Author: Amanda Swift (Primary School Teacher & Educational Content Developer)

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