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Form 4 Exponents and Logarithms Practice

Form 4 · 60 practice questions with instant marking and worked solutions.

Exponents and Logarithms is an important part of the Form 4 mathematics curriculum. This topic develops exponential and logarithmic forms, laws, equations and domains. Begin by identifying what every number, symbol, diagram and unit represents. Translate the information into a mathematical relationship before calculating. Each line of working should have a purpose. Finally use estimation, substitution, an inverse operation, or a second representation to check the result. This habit separates a misunderstanding from a copying error and makes correction more useful.

A reliable approach to Exponents and Logarithms has four stages. First, mark the given information and the quantity required. Second, choose an appropriate representation, property or formula. Third, carry out the operations in a clear order while retaining signs and units. Fourth, return to the original context and decide whether the result is possible. For a graph or table, read the title, scale and labels before using a value. For algebra, inspect brackets, negative signs and the order of operations before simplifying.

The 60 original questions in this topic use a shared mathematical specification in Chinese and English. Difficulty rises from level 1 to level 5. Early questions establish the language and direct skills of Exponents and Logarithms; middle questions add two-step reasoning, conversions and common variations; later questions connect ideas and require a deliberate check. In multiple-choice work, calculate before looking at the choices. In fill-in and short-answer work, retain decisive steps. For true-or-false statements, support the decision with a calculation or counterexample. 8 of them are DSE Paper 1 style structured questions answered in parts (a), (b), (c), where later parts build on earlier ones.

Effective revision is more than recording a score. After completing the Exponents and Logarithms set, group errors by concept tags and decide whether each problem arose from interpretation, forming an expression, calculation, or presenting the answer. Retry the item on a later day without opening the solution, then test the same method with a different value. If the same tag appears repeatedly, return to the explanation and rebuild the concept. If signs or units are the issue, use a fixed pre-submission checklist.

Exponents and Logarithms should also connect with the rest of mathematics. Number and algebra supply calculation tools; measurement and geometry give spatial meaning; data handling asks what a result means. A learner who can explain aloud why every step is valid has moved beyond imitation. Estimate a reasonable range, complete an exact solution, and compare the two. Agreement between context, estimate and exact answer is strong evidence that the solution is sound.

This batch adds 20 questions, bringing the topic to 60. The new questions cover controlled variations of different concepts, with paired bilingual conditions, hints, worked solutions and reproducible checks.

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  1. 1 Basic
    In Exponents and Logarithms, calculate $\log_{3}27$. Choose the correct answer.
  2. 2 Basic
    In Exponents and Logarithms, calculate $\log_{4}64$. Give the numerical value only.

  3. 3 Basic
    In Exponents and Logarithms, calculate $\log_{2}8$. Show the essential working and give the numerical value.

  4. 4 Basic
    In Exponents and Logarithms, the value of $\log_{3}27$ is 4. Is this statement true?
  5. 5 Basic
    Without using a calculator, find the value of $\log_{10} 10000$. Choose the correct answer.
  6. 6 Basic
    Without using a calculator, find the value of $\log 4+\log 250$. Give the answer only.

  7. 7 Basic
    Without using a calculator, find the value of $\log_{5} 375-\log_{5} 3$. Show the essential working and give the answer.

  8. 8 Basic
    Solve $3^{x+2}=81$. The value of $x$ is 6. Is this true?
  9. 9 Basic
    Without using a calculator, find the value of $\log_{5} 125$. Choose the correct answer.
  10. 10 Basic
    Without using a calculator, find the value of $\log 50+\log 20$. Give the answer only.

  11. 11 Basic
    Without using a calculator, find the value of $\log_{3} 21-\log_{3} 7$. Show the essential working and give the answer.

  12. 12 Basic
    Solve $2^{x-2}=16$. The value of $x$ is 2. Is this true?
  13. 13 Standard
    In Exponents and Logarithms, calculate $\log_{4}256$. Choose the correct answer.
  14. 14 Standard
    In Exponents and Logarithms, calculate $\log_{2}16$. Give the numerical value only.

  15. 15 Standard
    In Exponents and Logarithms, calculate $\log_{3}81$. Show the essential working and give the numerical value.

  16. 16 Standard
    In Exponents and Logarithms, the value of $\log_{4}256$ is 4. Is this statement true?
  17. 17 Standard
    Solve $\log_{3}(x-6)=4$. Find the value of $x$. Choose the correct answer.
  18. 18 Standard
    It is given that $\frac{(a^{2})^{3}}{a^{3}}=a^k$ where $a\neq 0$. Find the value of $k$. Give the answer only.

  19. 19 Standard
    Without using a calculator, find the value of $\log_{9} 243$ (as a fraction in lowest terms). Show the essential working and give the answer.

  20. 20 Standard DSE long question
    Let $\log_2 M=6$ and $\log_2 N=5$. Answer each part; give the answer only.
    1. (a) Find $\log_2(MN)$.
    2. (b) Find $\log_2\frac{M}{N}$.
    3. (c) Find $\log_2(M^2\sqrt{N^2})$.
    4. (d) Find $M$.
  21. 21 Standard
    Solve $\log_{2}(x-7)=3$. Find the value of $x$. Choose the correct answer.
  22. 22 Standard
    It is given that $\frac{(a^{2})^{2}}{a^{4}}=a^k$ where $a\neq 0$. Find the value of $k$. Give the answer only.

  23. 23 Standard
    Without using a calculator, find the value of $\log_{8} 32$ (as a fraction in lowest terms). Show the essential working and give the answer.

  24. 24 Standard DSE long question
    Let $\log_2 M=3$ and $\log_2 N=1$. Answer each part; give the answer only.
    1. (a) Find $\log_2(MN)$.
    2. (b) Find $\log_2\frac{M}{N}$.
    3. (c) Find $\log_2(M^2\sqrt{N^2})$.
    4. (d) Find $M$.
  25. 25 Advanced
    In Exponents and Logarithms, calculate $\log_{2}32$. Choose the correct answer.
  26. 26 Advanced
    In Exponents and Logarithms, calculate $\log_{3}243$. Give the numerical value only.

  27. 27 Advanced
    In Exponents and Logarithms, calculate $\log_{4}1024$. Show the essential working and give the numerical value.

  28. 28 Advanced
    In Exponents and Logarithms, the value of $\log_{2}32$ is 6. Is this statement true?
  29. 29 Advanced
    Without using a calculator, find the value of $\log_{3} 243$. Choose the correct answer.
  30. 30 Advanced
    Without using a calculator, find the value of $\log 2+\log 500$. Give the answer only.

  31. 31 Advanced
    Without using a calculator, the value of $\log_{2} 12-\log_{2} 3$ is 2. Is this true?
  32. 32 Advanced DSE long question
    A bacteria count is $N(t)=A\cdot 2^{t/2}$ with $t$ in hours, and $N(0)=100$. Answer each part; give the answer only.
    1. (a) Find $A$.
    2. (b) Find $N(6)$.
    3. (c) Find the time in hours for the count to reach $1600$.
  33. 33 Advanced
    Without using a calculator, find the value of $\log_{5} \frac{1}{25}$. Choose the correct answer.
  34. 34 Advanced
    Without using a calculator, find the value of $\log 5+\log 20000$. Give the answer only.

  35. 35 Advanced
    Without using a calculator, the value of $\log_{3} 162-\log_{3} 6$ is 3. Is this true?
  36. 36 Advanced DSE long question
    A bacteria count is $N(t)=A\cdot 2^{t/2}$ with $t$ in hours, and $N(0)=100$. Answer each part; give the answer only.
    1. (a) Find $A$.
    2. (b) Find $N(4)$.
    3. (c) Find the time in hours for the count to reach $800$.
  37. 37 Challenging
    In Exponents and Logarithms, calculate $\log_{3}9$. Choose the correct answer.
  38. 38 Challenging
    In Exponents and Logarithms, calculate $\log_{4}16$. Give the numerical value only.

  39. 39 Challenging
    In Exponents and Logarithms, calculate $\log_{2}4$. Show the essential working and give the numerical value.

  40. 40 Challenging
    In Exponents and Logarithms, the value of $\log_{3}9$ is 2. Is this statement true?
  41. 41 Challenging
    Solve $2^{x+4}=32$. Find the value of $x$. Choose the correct answer.
  42. 42 Challenging
    Solve $\log_{10}(x-5)=2$. Find the value of $x$. Show the essential working and give the answer.

  43. 43 Challenging
    It is given that $\frac{(a^{3})^{4}}{a^{7}}=a^k$ where $a\neq 0$. The value of $k$ is 0. Is this true?
  44. 44 Challenging DSE long question
    Let $\log_2 M=7$ and $\log_2 N=3$. Answer each part; give the answer only.
    1. (a) Find $\log_2(MN)$.
    2. (b) Find $\log_2\frac{M}{N}$.
    3. (c) Find $\log_2(M^2\sqrt{N^2})$.
    4. (d) Find $M$.
  45. 45 Challenging
    Solve $5^{x-3}=625$. Find the value of $x$. Choose the correct answer.
  46. 46 Challenging
    Solve $\log_{10}(x-7)=1$. Find the value of $x$. Show the essential working and give the answer.

  47. 47 Challenging
    It is given that $\frac{(a^{4})^{4}}{a^{3}}=a^k$ where $a\neq 0$. The value of $k$ is 5. Is this true?
  48. 48 Challenging DSE long question
    Let $\log_2 M=7$ and $\log_2 N=1$. Answer each part; give the answer only.
    1. (a) Find $\log_2(MN)$.
    2. (b) Find $\log_2\frac{M}{N}$.
    3. (c) Find $\log_2(M^2\sqrt{N^2})$.
    4. (d) Find $M$.
  49. 49 Elite
    In Exponents and Logarithms, calculate $\log_{4}64$. Choose the correct answer.
  50. 50 Elite
    In Exponents and Logarithms, calculate $\log_{2}8$. Give the numerical value only.

  51. 51 Elite
    In Exponents and Logarithms, calculate $\log_{3}27$. Show the essential working and give the numerical value.

  52. 52 Elite
    In Exponents and Logarithms, the value of $\log_{4}64$ is 4. Is this statement true?
  53. 53 Elite
    Without using a calculator, find the value of $\log_{4} 128$ (as a fraction in lowest terms). Give the answer only.

  54. 54 Elite
    Without using a calculator, find the value of $\log_{5} 25$. Show the essential working and give the answer.

  55. 55 Elite
    Without using a calculator, the value of $\log 40+\log 25$ is 3. Is this true?
  56. 56 Elite DSE long question
    A bacteria count is $N(t)=A\cdot 2^{t/5}$ with $t$ in hours, and $N(0)=400$. Answer each part; give the answer only.
    1. (a) Find $A$.
    2. (b) Find $N(10)$.
    3. (c) Find the time in hours for the count to reach $3200$.
  57. 57 Elite
    Without using a calculator, find the value of $\log_{16} 8$ (as a fraction in lowest terms). Give the answer only.

  58. 58 Elite
    Without using a calculator, find the value of $\log_{10} \frac{1}{100}$. Show the essential working and give the answer.

  59. 59 Elite
    Without using a calculator, the value of $\log 50+\log 200$ is 4. Is this true?
  60. 60 Elite DSE long question
    A bacteria count is $N(t)=A\cdot 2^{t/5}$ with $t$ in hours, and $N(0)=200$. Answer each part; give the answer only.
    1. (a) Find $A$.
    2. (b) Find $N(10)$.
    3. (c) Find the time in hours for the count to reach $1600$.

The report lists what you got wrong and why. Only you can see it.

Common mistakes

Common mistakes in Exponents and Logarithms

This topic needs particular care with exponential and logarithmic forms, laws, equations and domains. The first mistake is applying a remembered rule before reading all conditions. The second is compressing working so much that a sign, bracket, decimal point or unit disappears. The third is accepting an impossible answer without checking: for example, a probability above one, a negative physical length, an angle outside the geometric constraints, or a result far from the estimate. Separate the conditions, model, calculation and check, and finish by stating what the answer represents.

More Form 4 topics

Form 4 mixed revision → My mistakes →

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Repeating the same mistake usually means an earlier concept never landed. We find that step in the trial lesson.

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