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Decimal Numbers (Year 4)
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.

  • 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.
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.

1 .
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
2 .
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
3 .
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
4 .
Which is the largest?
2.9
3.4
4.3
0.8
All the other numbers have less than 4 ones
5 .
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
6 .
Which is the smallest?
1.7
0.9
2.1
0.3
3?10 is less than 9?10
7 .
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
8 .
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
9 .
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
10 .
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
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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