Arithmetic & Mathematics 100 MCQs | Number System, Percentage, Profit-Loss, Interest, Ratio, Time-Work, Average, Mensuration for RI

MCQ Test Zone March 24, 2026

📘 Introduction

Arithmetic mathematics is one of the most important sections in competitive exams like OSSSC RI, ARI, Amin, and other state-level exams. Questions are generally asked from topics such as percentage, profit and loss, ratio, average, time and work, and basic calculations.

This section is considered highly scoring because most questions are formula-based and easy to solve with practice. By regularly solving MCQs, candidates can improve their calculation speed and accuracy. This quiz is designed with clear explanations so that you can understand each concept easily and perform better in exams.

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📝 Arithmetic MCQs (With Explanation)

🔹 Section 1: Percentage

Q1. 20% of 150 = ?
A. 20
B. 25
C. 30
D. 35
Answer: C
Explanation: (20/100) × 150 = 30.

Q2. Increase 200 by 10% = ?
A. 210
B. 220
C. 230
D. 240
Answer: B
Explanation: 10% of 200 = 20 → total = 220.

Q3. Decrease 500 by 20% = ?
A. 300
B. 350
C. 400
D. 450
Answer: C
Explanation: 20% of 500 = 100 → 500 − 100 = 400.

👉 Exam Tip: Percentage questions are frequently asked and easy to score.

🔹 Section 2: Profit & Loss

Q4. CP = 100, SP = 120, Profit = ?
A. 10
B. 15
C. 20
D. 25
Answer: C
Explanation: Profit = SP − CP = 20.

Q5. CP = 200, SP = 180, Loss = ?
A. 10
B. 15
C. 20
D. 25
Answer: C
Explanation: Loss = 200 − 180 = 20.

Q6. Profit % = ? (CP=100, Profit=20)
A. 10%
B. 15%
C. 20%
D. 25%
Answer: C
Explanation: Profit% = (20/100) × 100 = 20%.

👉 Quick Tip: Always remember Profit = SP − CP.

🔹 Section 3: Ratio & Average

Q7. Ratio of 10:20 = ?
A. 1:2
B. 2:1
C. 5:10
D. 10:1
Answer: A
Explanation: Divide both numbers by 10.

Q8. Average of 10, 20, 30 = ?
A. 10
B. 20
C. 30
D. 40
Answer: B
Explanation: (10+20+30)/3 = 20.

Q9. Ratio of 15:5 = ?
A. 1:3
B. 3:1
C. 5:1
D. 2:1
Answer: B
Explanation: Divide by 5 → 3:1.

👉 Exam Tip: Ratio and average questions are simple and scoring.

🔹 Section 4: Time & Work

Q10. A can do work in 10 days. One day work = ?
A. 1/10
B. 1/5
C. 1/2
D. 1/20
Answer: A
Explanation: Work per day = 1/total days = 1/10.

Q11. A completes work in 5 days. Total work = ?
A. 1
B. 5
C. 10
D. 15
Answer: A
Explanation: Total work is taken as 1.

👉 Quick Tip: Always assume total work = 1.

🔹 Section 5: Mixed Questions

Q12. 12 × 8 = ?
A. 96
B. 84
C. 88
D. 92
Answer: A
Explanation: 12 × 8 = 96.

Q13. Square root of 64 = ?
A. 6
B. 7
C. 8
D. 9
Answer: C
Explanation: 8 × 8 = 64.

Q14. Cube of 2 = ?
A. 4
B. 6
C. 8
D. 16
Answer: C
Explanation: 2 × 2 × 2 = 8.

Q15. 100 ÷ 5 = ?
A. 10
B. 15
C. 20
D. 25
Answer: C
Explanation: 100 ÷ 5 = 20.

🔑 Key Points Summary

  • Percentage = very important topic
  • Profit & Loss = formula-based
  • Ratio = simplify quickly
  • Average = sum ÷ total
  • Time & Work = assume total work = 1
  • Practice improves speed

📌 Conclusion

Arithmetic is one of the easiest and most scoring sections in competitive exams if you understand the concepts clearly. Focus on formulas, practice regularly, and try to solve questions quickly. Topics like percentage, ratio, and profit & loss are repeated frequently in exams. With consistent effort and revision, you can easily score high marks in arithmetic mathematics.

Arithmetic & Mathematics – 100 MCQs (My Real Study Notes for B.Ed Entrance)

So, I started preparing Maths for B.Ed entrance and honestly… this was the subject I feared the most 😅
Like numbers, formulas, calculations — I used to think “yeh mushkil hai”.

But after some practice, I realized something important:
Maths is not hard… it’s just about practice and tricks.

Now I actually enjoy solving questions (not always 😄 but better than before).

So here I’m sharing how I studied — simple way, like explaining to a friend.

1. Number System

When I first studied this, I thought it’s basic. But MCQs were tricky.

Important things:

  • Even numbers
  • Odd numbers
  • Prime numbers

My trick:

  • Even → divisible by 2
  • Prime → only 2 factors

Example:

Is 17 prime?
Check: only divisible by 1 and 17 → yes

One mistake I made:

I didn’t revise basics, so I got simple questions wrong.

2. Percentage

This topic is very important. Questions come almost every time.

Simple idea:

Percentage means “out of 100”

My trick:

  • 50% = half
  • 25% = 1/4
  • 10% = divide by 10

Example:

50% of 200 = 100
(half of 200)

One relatable example:

When we see “50% off” in shopping, we quickly understand price becomes half. Same concept in exam.

3. Profit & Loss

At first, I got confused between CP and SP.

Basic terms:

  • CP → Cost Price
  • SP → Selling Price

Simple trick:

  • Profit = SP > CP
  • Loss = CP > SP

Example:

Bought for 100, sold for 120 → profit = 20

4. Simple Interest

This topic is formula based, but easy.

Formula:

SI = (P × R × T) / 100

My trick:

Don’t panic seeing formula. Just understand parts:

  • P = Principal
  • R = Rate
  • T = Time

Example:

P = 1000, R = 10%, T = 1
SI = 100

5. Ratio & Proportion

This topic looks confusing but actually simple.

Basic idea:

Comparison between two numbers

Example:

2:4 = 1:2

My trick:

Always simplify ratio.

6. Time & Work

This topic was difficult for me in beginning.

Simple idea:

  • More people → less time
  • Less people → more time

Example:

If 1 person takes 10 days
Then 2 persons → 5 days

My realization:

Think logically, not just formula.

7. Average

This is easy and scoring.

Formula:

Average = Sum / Number

Example:

Marks: 10, 20, 30
Sum = 60
Average = 20

My tip:

Don’t make calculation mistakes.

8. Mensuration

This part is about shapes and formulas.

Important shapes:

  • Square
  • Rectangle
  • Circle

My trick:

Remember only basic formulas.

Example:

Area of square = side × side

How I Practice MCQs

Earlier I was just reading formulas.

But I kept forgetting.

Then I changed:

  1. Study concept
  2. Solve MCQs
  3. Check answers
  4. Revise

Now I feel more confident.

Sample MCQs

1. 25% of 200 = ?
Answer: 50

2. Profit when SP = 120, CP = 100?
Answer: 20

3. SI of 1000 at 10% for 1 year?
Answer: 100

4. Average of 10, 20, 30?
Answer: 20

5. Ratio 4:8 = ?
Answer: 1:2

6. Area of square (side 4)?
Answer: 16

Mistakes I Made

1. Not practicing enough

Maths needs practice.

2. Fear of formulas

But they are simple.

3. Calculation errors

Small mistakes reduce marks.

One Small Insight

Maths is not about intelligence.

It’s about practice.

Even weak student can score high.

One Relatable Example

Sometimes I knew formula, but in exam I panicked and forgot.

So now I revise formulas daily.

My Personal Tips

1. Practice daily

Even 20 questions help.

2. Focus on basics

Strong base is important.

3. Revise formulas

Very important.

4. Stay calm

Don’t panic.

Final Thoughts

Maths for B.Ed is not very tough.

But you need practice.

Just remember:

  • Practice regularly
  • Learn tricks
  • Revise formulas

Even 1 hour daily is enough.

MCQ Practice Rules

  • Read question carefully
  • Don’t rush
  • Check calculations
  • Revise mistakes



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