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There are 10 millimetres in a centimetre.

Decimal Numbers (Year 5)

Decimals in KS2 Maths help with accuracy. Pupils learn how even small numbers after the point can make a big difference in measurement, money, and time.

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Fascinating Fact:

The world record for the men’s 100 metres sprint is 9.58 seconds, and that decimal makes all the difference.

In KS2 Maths, decimals are taught to show numbers that are not whole. Pupils practise comparing, ordering, and calculating with decimals, linking them to fractions and real-life uses.

Key Terms

Decimal point: A dot used to separate whole numbers from fractional parts.
Place value: The value of a digit depending on where it is, such as tenths or hundredths.
Rounding: Reducing a number to a simpler form, keeping it close to the original value.

Frequently Asked Questions (Click to see answers)

How are decimals explained in KS2?

In KS2, decimals are explained as parts of whole numbers. For example, 0.3 means three tenths, and 0.25 means twenty five hundredths.

Why are decimals important in real life?

Decimals are important because they are used in money, measuring time, distance, and weight, where accuracy matters in daily life.

How do decimals link with fractions?

Decimals are another way to write fractions. For example, 0.5 is the same as 1/2, and 0.75 is the same as 3/4.

Try These Related Quizzes

1 .

Which is the largest?

0.35

0.05

0.03

0.3

³⁵?₁₀₀ is larger than ³⁰?₁₀₀, ⁵?₁₀₀ or ³?₁₀₀

2 .

What does the digit 2 represent in 5.12?

2 tens

2 tenths

2 ones

2 hundredths

In decimals the first column after the ones is tenths and the second column is hundredths

3 .

What is 8.5cm in mm?

8.5mm

85mm

850mm

8,500mm

There are 10mm in 1cm therefore we multiply by 10 to find the answer

4 .

How is 0.07 changed to 0.02?

Add 0.5

Subtract 0.5

Subtract 0.05

Add 0.05

Just like 7 - 5 = 2
0.07 - 0.05 = 0.02

5 .

Which is the smallest of these numbers?

0.12

1.02

0.02

0.01

¹?₁₀₀ is less than ²?₁₀₀, ¹²?₁₀₀ and ¹⁰²?₁₀₀

6 .

What is the figure 6 worth in 0.26?

6 hundredths

6 ones

6 tenths

6 tens

Remember - tenths, hundredths, thousandths

7 .

What is the next number in the following sequence? 0.24, 0.26, 0.28, 0.3

0.32

0.35

1.3

1.32

The numbers are going up by 0.02, or ²?₁₀₀ every time

8 .

Which is the decimal fraction equivalent to seven and forty two hundredths?

7.042

7.42

0.742

74.2

Forty two hundredths is equivalent to four tenths and two hundredths

9 .

How is 3.57 changed to 3.6?

Add 0.03

Subtract 0.3

Add 0.3

Subtract 0.03

Just like 357 + 3 = 360
3.57 + 0.03 = 3.6

10 .

Which is a decimal fraction halfway between 2.1 and 2.2?

2.12

2.13

2.14

2.15

There are ten hundredths in a tenth so half of one tenth is 5 hundredths

You can find more about this topic by visiting BBC Bitesize - Comparing and ordering decimals

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

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