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Decimal Numbers (Year 4)
There are 100 one penny pieces in a pound.

Decimal Numbers (Year 4)

In KS2 Maths, kids will explore exciting decimal numbers! In Year Four, they'll dive into tenths, learning where numbers belong in decimal land. Adding and subtracting with decimals will become a breeze, and they'll even get the hang of rounding these special numbers up or down.

Decimal numbers aren't whole, like 3 or 7. They're a bit fancier, with dots called decimal points. Just like adding 11 + 12, adding 1.1 + 1.2 is cool! Decimals can also be buddies with their closest whole numbers, like 4.7 hanging out with 5. But 4.4 prefers to chill with 4. We call this rounding up or down.

Feeling adventurous? Take this fun quiz to show off your skills in adding, subtracting, and rounding decimal numbers!

Are Quizzes the Key to Children's Success? Find Out
1.
Which is the smallest?
1.7
0.9
2.1
0.3
310 is less than 910
2.
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
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.
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
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.
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 710
7.
Which is the largest?
2.9
3.4
4.3
0.8
All the other numbers have less than 4 ones
8.
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
9.
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
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

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