NUMBERS

1. Write \( 0.00043 \) in standard form.
2. Express \( \frac{2}{3} \) as a decimal.
3. What is the HCF of 48 and 180?
4. Find the LCM of 12, 18, and 30.
5. Is \( \sqrt{5} \) a rational or irrational number?
6. Simplify \( \sqrt{50} \).
7. Write 567 as a product of its prime factors.
8. Find the value of \( 2^3 \times 2^4 \).
9. Evaluate \( \frac{3}{5} + \frac{4}{10} \).
10. Convert 3.1416 to a fraction (approximate).
11. Arrange the following in ascending order: \(-3, 0, 2.5, -1.4\).
12. What is the additive inverse of \(-8\)?
13. Find the product of \(-7\) and \(9\).
14. Convert \( 1.2 \times 10^{-3} \) to an ordinary number.
15. Simplify \( \frac{2^5}{2^3} \).
16. Is \( 0.125 \) a rational number? Explain.
17. Express \( 0.75 \) as a fraction in simplest form.
18. List all prime numbers between 20 and 40.
19. What is the cube root of \( 64 \)?
20. Express \( 98 \) as a product of primes.
21. Find the square of \( 1.5 \).
22. Estimate the square root of \( 200 \) (to 1 decimal place).
23. What is the difference between irrational and rational numbers?
24. Simplify \( \sqrt{18} + \sqrt{8} \).
25. Evaluate \( 3^{-2} \).
26. Solve: \( x \times 4 = 20 \), find \( x \).
27. Is \( \pi \) a rational number? Explain.
28. Convert \( \frac{5}{8} \) into a percentage.
29. Simplify \( (3 \times 10^4) \times (2 \times 10^2) \).
30. Write the number \( 0.000007 \) in standard form.