### Mental arithmetic

** Answers, explanations, and assessments**

It is evident that mental arithmetic is not practiced in today’s education system to the extent that it was several years ago, when children would learn their multiplication tables so well off by heart that they could give the answer to sums such as 9 multiplied by 8 or 6 multiplied by 7almost without thinking. Perhaps this is not completely surprising in view of the widespread use of calculators and computers; nevertheless, proficiency at mental arithmetic is a valuable asset to have at ones disposal and it is also an excellent way of exercising the brain.

The following is a mental arithmetic speed test of 30 questions, which gradually increase in difficulty as the test progresses. You shouldwork quickly and calmly and try to think at all times of the quickest and most efficient way of tackling the questions.

You have 45 minutes in which to solve the 30 questions.

The use of a calculator is not permitted in this test and only the answer should be committed to paper, the object of the test being that all the working out is done in your head.

1. What is 9 multiplied by 8?

2. What is 126 divided by 3?

3. What is 15 multiplied by 11?

4. What is 45% of 300?

5. Multiply 7 by 12 and divide by 6

6. Divide 56 by 8 and add 17.

7. What is 35% of 250?

8. What is 58 of 240?

9. Multiply 15 by 6 and subtract 29.

10. What is 34 of 92 plus 13?

11. Multiply 7 by 4 by 6.

12. Divide 52 by 4 and add 17 multiplied by 3.

13. What is 3206 divided by 7?

14. Add 32 þ 8 þ 18 þ 25.

15. What is 55% of 320?

16. What is 59 of 270?

17. Which is greater, 58 of 112 or 78 of 88?

18. Add 5683 to 1729 and divide by 2.

19. Divide 672 by 12.

20. Subtract 369 from 1250.

21. Add 25 of 90 to 56 of 78.

22. Multiply 72 by 15.

23. What is 840 expressed as a decimal?

24. Deduct 865 from 1063.

25. Multiply 694 by 11.

26. Multiply 86 by 9 and add to 13 multiplied by 6.

27. What is 1000 less 59 of 117?

28. What is 5.9 þ 6.8 þ 7.34?

29. Deduct 7.3 from 34.2.

30. Multiply 6.85 by 7.