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Maths Quiz - Decimal Numbers (Year 5) (Questions)

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. What does the digit 2 represent in 5.12?
[ ] 2 tens
[ ] 2 tenths
[ ] 2 ones
[ ] 2 hundredths
2. What is the figure 6 worth in 0.26?
[ ] 6 hundredths
[ ] 6 ones
[ ] 6 tenths
[ ] 6 tens
3. Which is the decimal fraction equivalent to seven and forty two hundredths?
[ ] 7.042
[ ] 7.42
[ ] 0.742
[ ] 74.2
4. 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
5. How is 3.57 changed to 3.6?
[ ] Add 0.03
[ ] Subtract 0.3
[ ] Add 0.3
[ ] Subtract 0.03
6. How is 0.07 changed to 0.02?
[ ] Add 0.5
[ ] Subtract 0.5
[ ] Subtract 0.05
[ ] Add 0.05
7. Which is the smallest of these numbers?
[ ] 0.12
[ ] 1.02
[ ] 0.02
[ ] 0.01
8. Which is the largest?
[ ] 0.35
[ ] 0.05
[ ] 0.03
[ ] 0.3
9. Which is a decimal fraction halfway between 2.1 and 2.2?
[ ] 2.12
[ ] 2.13
[ ] 2.14
[ ] 2.15
10. What is 8.5cm in mm?
[ ] 8.5mm
[ ] 85mm
[ ] 850mm
[ ] 8,500mm

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

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Maths Quiz - Decimal Numbers (Year 5) (Answers)
1. What does the digit 2 represent in 5.12?
[ ] 2 tens
[ ] 2 tenths
[ ] 2 ones
[x] 2 hundredths
In decimals the first column after the ones is tenths and the second column is hundredths
2. What is the figure 6 worth in 0.26?
[x] 6 hundredths
[ ] 6 ones
[ ] 6 tenths
[ ] 6 tens
Remember - tenths, hundredths, thousandths
3. Which is the decimal fraction equivalent to seven and forty two hundredths?
[ ] 7.042
[x] 7.42
[ ] 0.742
[ ] 74.2
Forty two hundredths is equivalent to four tenths and two hundredths
4. What is the next number in the following sequence? 0.24, 0.26, 0.28, 0.3
[x] 0.32
[ ] 0.35
[ ] 1.3
[ ] 1.32
The numbers are going up by 0.02, or 2?100 every time
5. How is 3.57 changed to 3.6?
[x] Add 0.03
[ ] Subtract 0.3
[ ] Add 0.3
[ ] Subtract 0.03
Just like 357 + 3 = 360
3.57 + 0.03 = 3.6
6. How is 0.07 changed to 0.02?
[ ] Add 0.5
[ ] Subtract 0.5
[x] Subtract 0.05
[ ] Add 0.05
Just like 7 - 5 = 2
0.07 - 0.05 = 0.02
7. Which is the smallest of these numbers?
[ ] 0.12
[ ] 1.02
[ ] 0.02
[x] 0.01
1?100 is less than 2?100, 12?100 and 102?100
8. Which is the largest?
[x] 0.35
[ ] 0.05
[ ] 0.03
[ ] 0.3
35?100 is larger than 30?100, 5?100 or 3?100
9. Which is a decimal fraction halfway between 2.1 and 2.2?
[ ] 2.12
[ ] 2.13
[ ] 2.14
[x] 2.15
There are ten hundredths in a tenth so half of one tenth is 5 hundredths
10. What is 8.5cm in mm?
[ ] 8.5mm
[x] 85mm
[ ] 850mm
[ ] 8,500mm
There are 10mm in 1cm therefore we multiply by 10 to find the answer
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