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Decimals are the basis of currencies: there are 100 pennies in one pound.

Addition and Subtraction 2 (Difficult)

Test your brain with this advanced 11 Plus Maths quiz. Strengthen your accuracy and speed in addition and subtraction with problems designed to make you think hard.

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Fascinating Fact:

If you subtract one biscuit from a packet of ten every time you say “just one more,” you’ll reach zero biscuits faster than you think.

In 11 Plus Maths, addition and subtraction form the foundation for advanced topics like algebra, percentages, and ratio. Practising challenging problems improves precision and logical reasoning.

Key Terms

Difference: The result when one number is subtracted from another.
Regrouping: Borrowing or carrying numbers to make subtraction or addition easier.
Estimation: A sensible guess of an answer, often used to check accuracy.

Find helpful revision materials in our Guide to 11 Plus Courses and Materials for Parents .

Frequently Asked Questions (Click to see answers)

How can I improve accuracy in maths?

Work slowly and double-check each step. Estimation helps ensure your final answers make sense before moving on.

Why is subtraction important for higher maths?

Subtraction is used in algebra, fractions, and problem solving. Understanding it well helps with rearranging equations and balancing numbers.

What is the best way to practise addition and subtraction?

Try mental maths, flashcards, and small timed tests to build speed and confidence with different problem types.

Try These Related Quizzes

1 .

438.7 + 250.4 - 35.4 + 100 = ?

755.5

754.6

753.7

752.8

Breaking the problem into hundreds, tens, ones and decimals helps: 438.7 + 250.4 - 35.4 + 100 = (400 + 200 + 100) + (30 + 50 - 30) + (8 - 5) + (0.7 + 0.4 - 0.4) = 700 + 50 + 3 + 0.7 = 753.7

2 .

837.1 - 342.5 = ?

494.3

494.4

494.5

494.6

You can treat this as a normal subtraction. Just make sure you put the decimal point in the right place. Making an estimate (the answer should be somewhere around 500) will help you avoid answers like 49.46 or 4,946!

3 .

79.8 - 20.6 + 179.4 = ?

238.6

239.6

240.6

241.6

Splitting this into hundreds, tens, ones and decimal will help: 79.8 - 20.6 + 179.4 = (100) + (70 + 70 - 20) + (9 + 9) + (0.8 + 0.4 - 0.6) = 100 + 120 + 18 + 0.6 = 238.6

4 .

12.7 + 15.3 + 112.2 = ?

140.1

140.2

140.3

140.4

Keep an eye out for decimals that add up to whole numbers: 12.7 + 15.3 is the same as 12 + 15 + 1

5 .

500 + 255.8 + 38.1 = ?

792.9

793.9

794.9

795.9

You could tackle this problem starting with the highest number: 500 + 255.8 + 38.1 = (500 + 255.8) + 38.1 = 755.8 + 38.1 = 793.9

6 .

0.6 + 0.3 + 0.8 = ?

0.17

1.7

170

6 + 3 + 8 = 17, so 0.6 + 0.3 + 0.8 = 1.7. It's all about knowing where the decimal point should go!

7 .

745.9 + 118.6 – 12.7 = ?

851.8

852.8

853.8

854.8

Hundreds, tens, ones then decimals: 745.9 + 118.6 – 12.7 = (700 + 100) + (40 + 10 - 10) + (5 + 8 - 2) + (0.9 + 0.6 - 0.7) = 800 + 40 + 11 + 0.8 = 851.8

8 .

7.7 - 16.9 - 6.6 + 111.3 = ?

95.2

95.3

95.4

95.5

Remember, in multiple choice quizzes the final digit can give you the answer: 7 - 9 - 6 + 3 = -5, so you know that the last digit in the answer to 7.7 - 16.9 - 6.6 + 111.3 will also be a 5

9 .

180.7 + 43.2 + 18.4 = ?

241.3

242.3

243.3

244.3

Hundreds first, then tens, ones and, finally, decimals: 180.7 + 43.2 + 18.4 = (100) + (80 + 40 + 10) + (3 + 8) + (0.7 + 0.2 + 0.4) = 100 + 130 + 11 + 1.3 = 242.3

10 .

45.3 - 17.9 + 396.2 = ?

423.6

423.7

423.8

423.9

To avoid negative numbers, you can rearrange the problem: 45.3 - 17.9 + 396.2 = 396.2 + 45.3 - 17.9 = 441.5 - 17.9 = 423.6

Author: Frank Evans (Specialist 11 Plus Teacher and Tutor)