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SSC CHSL Number System & Simplification Questions
Practise number system & simplification (quantitative aptitude) for the SSC Combined Higher Secondary Level Examination: 10 multiple-choice questions, each with the correct answer and a worked explanation. Click an option to check it, or “New questions” for another set.
Number System & Simplification practice
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Q1.Find the next number in the series: 7, 9, 13, 19, 27, ?
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Answer: C — 37
Differences are 2, 4, 6, 8 → next difference 10.
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Q2.What is √3,481?
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Answer: B — 59
59 × 59 = 3481, so √3481 = 59.
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Q3.Simplify: 53 + 3 × 8 − 14
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Answer: B — 63
BODMAS: multiply first — 3 × 8 = 24; then 53 + 24 − 14 = 63.
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Q4.Simplify: 87 + 3 × 6 − 21
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Answer: C — 84
BODMAS: multiply first — 3 × 6 = 18; then 87 + 18 − 21 = 84.
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Q5.Find the next number in the series: 28, 38, 48, 58, 68, ?
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Answer: C — 78
Each term increases by 10.
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Q6.Simplify: 79 + 2 × 2 − 5
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Answer: D — 78
BODMAS: multiply first — 2 × 2 = 4; then 79 + 4 − 5 = 78.
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Q7.Find the next number in the series: 3, 6, 12, 24, 48, ?
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Answer: C — 96
Each term is multiplied by 2.
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Q8.Find the next number in the series: 15, 24, 33, 42, 51, ?
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Answer: A — 60
Each term increases by 9.
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Q9.Simplify: 55 + 2 × 2 − 23
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Answer: D — 36
BODMAS: multiply first — 2 × 2 = 4; then 55 + 4 − 23 = 36.
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Q10.What is √7,744?
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Answer: C — 88
88 × 88 = 7744, so √7744 = 88.
How to approach number system & simplification questions
Learn squares to 30 and cubes to 15, apply BODMAS strictly, and use HCF × LCM = product of two numbers. For series, check the differences first, then the ratios.
About SSC CHSL
SSC Combined Higher Secondary Level Examination — conducted by Staff Selection Commission (SSC). Recruits Class 12 pass candidates for posts such as LDC, JSA and Data Entry Operator.
Original practice questions written for this site in the style and difficulty of each exam’s syllabus. They are not past papers and the site is not affiliated with any exam body. Exam patterns, marking schemes and syllabi change — always check the latest official notification.
SSC CHSL practice topics
| Topic | Section | Question source |
|---|---|---|
| Percentages | Quantitative aptitude | Calculated (new numbers every set) |
| Averages & Statistics | Quantitative aptitude | Calculated (new numbers every set) |
| Number System & Simplification | Quantitative aptitude | Calculated (new numbers every set) |
| Logical Reasoning | Reasoning | Calculated (new numbers every set) |
| English Grammar | English | Question bank |
| Vocabulary & Idioms | English | Question bank |
| Indian Polity, History & Geography | General awareness | Question bank |