INTEGERS (āĻĒā§āϰā§āĻŖāϏāĻāĻā§āϝāĻž)
INTEGERS (āĻĒā§āϰā§āĻŖāϏāĻāĻā§āϝāĻž)
1. Definition (āϏāĻāĻā§āĻāĻž): Integers are numbers that include positive numbers, negative numbers, and zero.
The set of integers is: ...,−5,−4,−3,−2,−1,0,1,2,3,4,5,......,
2. Types of Integers (āĻĒā§āϰā§āĻŖāϏāĻāĻā§āϝāĻžā§° āĻĒā§ā§°āĻāĻžā§°)
i. Negative Integers (āĻāĻŖāĻžāϤā§āĻŽāĻ āĻĒā§ā§°ā§āĻŖāϏāĻāĻā§āϝāĻž)
- Examples: -1, -2, -3, -4, -5, ...
- Meaning: Numbers less than zero (0).
- These numbers always have a minus (-) sign.
- Example: -10, -25, -100
ii. Zero (āĻļā§āύā§āϝ)
- Example: 0
- Meaning: Neither positive nor negative.
- Zero separates positive integers from negative integers.
- Example: No profit, no loss = 0
iii. Positive Integers (āϧāύāĻžāϤā§āĻŽāĻ āĻĒā§ā§°ā§āĻŖāϏāĻāĻā§āϝāĻž)
- Examples: 1, 2, 3, 4, 5, ...
- Meaning: Numbers greater than zero (0).
- These numbers may be written with or without a plus (+) sign.
- Example: +5, +20, +100
Summary
- Negative Integers: -1, -2, -3, ... → Numbers less than 0
- Zero: 0 → Neither positive nor negative
- Positive Integers: 1, 2, 3, ... → Numbers greater than 0
3. Properties of Integers (āĻĒā§āϰā§āĻŖāϏāĻāĻā§āϝāĻžā§° āĻŦā§āĻļāĻŋāώā§āĻā§āϝ)
- They do not contain fractions or decimals.
- They extend infinitely in both positive and negative directions.
- Zero is neither positive nor negative.
Integer Rules : Click Here
Integers can be: i. Added, ii. Subtracted, iii. Multiplied, iv. Divided
Basic Operations (āĻŽā§āϞāĻŋāĻ āĻā§ā§°āĻŋāϝāĻŧāĻžāϏāĻŽā§āĻš)
Addition (āϝā§āĻ): 5 + (−2) = 3
Multiplication (āĻā§āĻŖ): (−2) ×4 = −8
Division (āĻāĻžāĻ): 12 ÷ (−3) = − 4
6. Number Line (āϏāĻāĻā§āϝāĻž ā§°ā§āĻāĻž)
←--------------------------------------------→
-5 -4 -3 -2 -1 0 1 2 3 4 5
Negative Integers Zero Positive IntegersIntegers extend infinitely in both directions.
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Integers MCQs
1. Which of the following is an integer ? (āύāĻŋāĻŽā§āύāϞāĻŋāĻāĻŋāϤ āĻā§āύāĻā§ āĻĒā§ā§°ā§āĻŖāϏāĻāĻā§āϝāĻž ?)
a) 2.5 b) -3 c) 1/2 d) 4.7
Ans: b) -3
Explanation: Integers are whole numbers without fractions or decimals. -3 is a whole number. āĻŦā§āϝāĻžāĻā§āϝāĻž: āĻĒā§ā§°ā§āĻŖāϏāĻāĻā§āϝāĻžāϤ āĻĻāĻļāĻŽāĻŋāĻ āĻŦāĻž āĻāĻā§āύāĻžāĻāĻļ āύāĻžāĻĨāĻžāĻā§āĨ¤ -3 āĻāĻāĻž āĻĒā§ā§°ā§āĻŖāϏāĻāĻā§āϝāĻžāĨ¤
2. Which integer is neither positive nor negative ? āĻā§āύāĻā§ āĻĒā§ā§°ā§āĻŖāϏāĻāĻā§āϝāĻž āϧāύāĻžāϤā§āĻŽāĻā§ āύāĻšāϝāĻŧ, āĻāĻŖāĻžāϤā§āĻŽāĻā§ āύāĻšāϝāĻŧ ?
a) 1 b) -1 c) 0 d) 10
Ans: c) 0
Explanation: Zero is the only integer that is neither positive nor negative. āĻŦā§āϝāĻžāĻā§āϝāĻž: āĻļā§āύā§āϝ (0) āĻāĻāĻŽāĻžāϤā§ā§° āĻĒā§ā§°ā§āĻŖāϏāĻāĻā§āϝāĻž āϝāĻŋ āϧāύāĻžāϤā§āĻŽāĻā§ āύāĻšāϝāĻŧ, āĻāĻŖāĻžāϤā§āĻŽāĻā§ āύāĻšāϝāĻŧāĨ¤
3. Which is a negative integer ? āĻā§āύāĻā§ āĻāĻŖāĻžāϤā§āĻŽāĻ āĻĒā§ā§°ā§āĻŖāϏāĻāĻā§āϝāĻž ?
a) 5 b) 0 c) -8 d) 9
Ans: c) -8
Explanation: Negative integers are numbers less than zero. āĻŦā§āϝāĻžāĻā§āϝāĻž: āĻļā§āύā§āϝāϤāĻā§ āϏ⧰⧠āϏāĻāĻā§āϝāĻžāĻŦā§ā§° āĻāĻŖāĻžāϤā§āĻŽāĻ āĻĒā§ā§°ā§āĻŖāϏāĻāĻā§āϝāĻžāĨ¤
4. What is 4 + (-6) ?
a) 10 b) -2 c) 2 d) -10
Ans: b) -2
Explanation: 4 + (-6) = 4 - 6 = -2. āĻŦā§āϝāĻžāĻā§āϝāĻž: 4 + (-6) āĻŽāĻžāύ⧠4 - 6 = -2āĨ¤
5. What is (-3) × 5 ?
a) 15 b) -15 c) 8 d) -8
Ans: b) -15
Explanation: A negative number multiplied by a positive number gives a negative number. āĻŦā§āϝāĻžāĻā§āϝāĻž: āĻāĻŖāĻžāϤā§āĻŽāĻ āϏāĻāĻā§āϝāĻž × āϧāύāĻžāϤā§āĻŽāĻ āϏāĻāĻā§āϝāĻž = āĻāĻŖāĻžāϤā§āĻŽāĻ āϏāĻāĻā§āϝāĻžāĨ¤
Tough MCQs on Integers
6. What is (-7) + 12 ?
a) -19 b) 19 c) 5 d) -5
Ans: c) 5
Explanation: Starting from -7 and moving 12 steps right gives 5. āĻŦā§āϝāĻžāĻā§āϝāĻž: -7 ā§° āĻĒā§°āĻž 12 āĻā§° āϏā§āĻāĻĢāĻžāϞ⧠āĻ'āϞ⧠5 āĻĒā§ā§ąāĻž āϝāĻžāϝāĻŧāĨ¤
7. What is (-9) - (-4) ?
a) -13 b) -5 c) 5 d) 13
Ans: b) -5
Explanation: Subtracting a negative is the same as adding a positive. So, -9 + 4 = -5. āĻŦā§āϝāĻžāĻā§āϝāĻž: āĻāĻŖāĻžāϤā§āĻŽāĻ āϏāĻāĻā§āϝāĻž āĻŦāĻŋāϝāĻŧā§āĻ āĻā§°āĻž āĻŽāĻžāύ⧠āϧāύāĻžāϤā§āĻŽāĻ āϏāĻāĻā§āϝāĻž āϝā§āĻ āĻā§°āĻžāĨ¤ āϏā§āϝāĻŧā§ -9 + 4 = -5āĨ¤
8. What is (-8) × (-6) ?
a) -48 b) 48 c) -14 d) 14
Ans: b) 48
Explanation: Negative × Negative = Positive. āĻŦā§āϝāĻžāĻā§āϝāĻž: āĻāĻŖāĻžāϤā§āĻŽāĻ × āĻāĻŖāĻžāϤā§āĻŽāĻ = āϧāύāĻžāϤā§āĻŽāĻāĨ¤
9. What is 36 ÷ (-9) ?
a) 4 b) -4 c) -45 d) 45
Ans: b) -4
Explanation: Positive ÷ Negative = Negative. āĻŦā§āϝāĻžāĻā§āϝāĻž: āϧāύāĻžāϤā§āĻŽāĻ ÷ āĻāĻŖāĻžāϤā§āĻŽāĻ = āĻāĻŖāĻžāϤā§āĻŽāĻāĨ¤
10. Which statement is true ? āĻā§āύāĻā§ āĻŦāĻā§āϤāĻŦā§āϝ āϏāĻ āĻŋāĻ ?
a) Zero is positive b) Zero is negative c) Both positive and negative d) Neither positive nor negative
Ans: d) Neither positive nor negative
Explanation: Zero lies between positive and negative numbers. āĻŦā§āϝāĻžāĻā§āϝāĻž: āĻļā§āύā§āϝ āϧāύāĻžāϤā§āĻŽāĻ āĻā§°ā§ āĻāĻŖāĻžāϤā§āĻŽāĻ āϏāĻāĻā§āϝāĻžā§° āĻŽāĻžāĻāϤ āĻ ā§ąāϏā§āĻĨāĻŋāϤāĨ¤
Trick (āĻā§ā§°āĻŋāĻ)
- Positive + Positive = Positive (āϧāύāĻžāϤā§āĻŽāĻ + āϧāύāĻžāϤā§āĻŽāĻ = āϧāύāĻžāϤā§āĻŽāĻ)
- Negative + Negative = Negative (āĻāĻŖāĻžāϤā§āĻŽāĻ + āĻāĻŖāĻžāϤā§āĻŽāĻ = āĻāĻŖāĻžāϤā§āĻŽāĻ)
- Positive × Negative = Negative (āϧāύāĻžāϤā§āĻŽāĻ × āĻāĻŖāĻžāϤā§āĻŽāĻ = āĻāĻŖāĻžāϤā§āĻŽāĻ)
- Negative × Negative = Positive (āĻāĻŖāĻžāϤā§āĻŽāĻ × āĻāĻŖāĻžāϤā§āĻŽāĻ = āϧāύāĻžāϤā§āĻŽāĻ)