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Number: number sentences and algebraic thinking
Practice Questions

40 SEA Mathematics questions on Number: number sentences and algebraic thinking, each with instant feedback and a full examiner-style mark scheme.

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✨ Revision guide includes key terms, worked examples and exam technique for Number: number sentences and algebraic thinking.

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Question 1 · 1 mark · Difficulty 1/3

What is the value of ▲ in the number sentence ▲ + 8 = 15?

  1. 7
  2. 9
  3. 23
  4. 6
Show answer & explanation
✓ Answer: A7
Award 1 mark. To undo adding 8 you take 8 away from 15, and 15 − 8 = 7. Adding 8 to 15 gives 23, which does the opposite of what is needed.
Question 2 · 1 mark · Difficulty 1/3

What is the value of ■ in the number sentence ■ − 6 = 12?

  1. 6
  2. 2
  3. 18
  4. 72
Show answer & explanation
✓ Answer: C18
Award 1 mark. To undo subtracting 6 you add 6 back, and 12 + 6 = 18. Checking gives 18 − 6 = 12, so the sentence is true.
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SEA Mathematics: Number: number sentences and algebraic thinking FAQ

Is Kramizo free for SEA students preparing for Mathematics?
Yes — completely free. Every student gets 45 questions a day on the free plan, with no card required and no trial countdown. That free quota works across every subject and every topic in our bank, so you can mix Number: number sentences and algebraic thinking practice with other Mathematics topics or even switch to a totally different SEA subject without paying anything. Kramizo's optional Pro plan removes the daily cap and adds detailed progress analytics, but the free tier is the real product — used by thousands of GCSE, IGCSE and CSEC students.
Are the Number: number sentences and algebraic thinking questions aligned to the official SEA Mathematics syllabus?
Every question is written against the published SEA Mathematics specification, including the exact command words (state, describe, explain, calculate, evaluate, etc.), mark allocations, and difficulty tier you'd see on a real SEA paper. Explanations are written in the style of official examiner mark schemes — they tell you what is being awarded marks and why distractors are wrong, not just whether you got it right. The bank is continually refined to match the latest syllabus updates from SEA.
How is Number: number sentences and algebraic thinking typically tested on SEA Mathematics papers?
Number: number sentences and algebraic thinking appears across multiple question types on real SEA Mathematics papers — most commonly as multiple-choice questions in the objective section, structured short-answer questions in the main paper, and occasionally as part of an extended response. Kramizo's practice bank reflects that mix: 4-option MCQs, true/false statements, fill-in-the-blank key terms, multi-select questions, and ordering questions. Working through the bank gives you exposure to every question style examiners actually use.

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