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Percentage

Secondary 1 practice

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Percentage practice questions

Secondary 1 topics, the foundation the O-Level Mathematics 4052 syllabus builds on. Every question below has a full worked solution.

When a student gets a question wrong in Math Amigo, it does not show the answer straight away. It reads the working, identifies the step that went wrong, and asks a question that points at the correction. The worked solution is there once a genuine attempt has been made.

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Read the Percentage study notes: the method, worked examples and the mistakes that cost marks. Free, no account.

What this topic covers

Worked examples

Example 1

Express 0.25%0.25\% as a decimal.
Show the worked solution
  • 0.25%=0.251000.25\% = \frac{0.25}{100}
  • =0.0025= 0.0025

Answer: 0.00250.0025

Example 2

There are 8 boys and 32 girls in a class. What percentage of the class are boys?
Show the worked solution
  • Total students =8+32= 8 + 32
  • =40= 40
  • Percentage of boys =840×100%= \dfrac{8}{40} \times 100\%
  • =20%= 20\%

Answer: 2020

Example 3

After an increase of 5%5\%, a salary is $3360\$3360. Find the original salary.
Show the worked solution
  • Let the original salary be xx.
  • x×(1+5100)=3360x \times \left(1 + \dfrac{5}{100}\right) = 3360
  • x×1.05=3360x \times 1.05 = 3360
  • x=33601.05x = \dfrac{3360}{1.05}
  • x=$3200x = \$3200

Answer: 32003200

Questions parents ask

Is it really free?

The free plan is permanent and does not ask for a card. It has daily limits on the AI feedback, and the paid plans lift them.

Which syllabus does this follow?

O-Level Mathematics (4052), for Singapore secondary students. Math Amigo covers Secondary 1 to 4, both O-Level Mathematics and Additional Mathematics.

Will it just show my child the answer?

No. On a wrong answer it looks at the working, points to the step that went wrong, and asks a question that helps the student find the correction. The full worked solution is available after a genuine attempt.

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