With calculators and cellphones we barely ever have to do mental maths these days and we have to admit we have gotten a little bit rusty! Try this fun brainteaser to challenge your brain with these seemingly simple problems! Ready? Steady? GO!

How did you do? Did you find these easy? We don’t blame you if you struggled – some of them were very tricky! We have the answers for you to double check your results against.

**Answers:**

- 14
- -2
- 15
- 16
- 9
- 25
- 0