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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 .

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

2 .

Which is the smallest?

1.7

0.9

2.1

0.3

³?₁₀ is less than ⁹?₁₀

3 .

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

4 .

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

5 .

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

6 .

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

7 .

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

8 .

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

9 .

Which is the largest?

2.9

3.4

4.3

0.8

All the other numbers have less than 4 ones

10 .

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

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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