Subtracting numbers in standard form

12 questions

1. Match each number in standard form to its equivalent ordinary number.
2. Without a calculator, work out 3.42 – 1.23.
3. Without a calculator, work out 28.48 – 3.203.
4. Without a calculator, work out 12.4 – 2.42 + 4.64.
5. 5^3 – 5^2 + \sqrt{25} = ___
6. Match each number to a correct statement about that number.
7. Work out 9.8\times10^5 - 6.8\times10^5 , giving your answer in standard form.
8. Work out 3\times10^{-8} - 1.8\times10^{-8} , giving your answer in standard form.
9. Work out 2.4\times10^7 - 3\text{ } 700\text{ }000, giving your answer in standard form.
10. Work out 4.9\times10^6- 280\text{ }000, giving your answer in standard form.
11. Work out 9.38 \times 10^{10} - 1 \text{ } 300 \text{ } 000 \text{ } 000. Give your answer in standard form.
12. 9 mm − 0.5 cm − 2\times10^{-3} m = ___ metres.

License: OGL