INTEGERS (āĻĒā§‚āĻ°ā§āĻŖāϏāĻ‚āĻ–ā§āϝāĻž)


INTEGERS (āĻĒā§‚āĻ°ā§āĻŖāϏāĻ‚āĻ–ā§āϝāĻž)


1. Definition (āϏāĻ‚āĻœā§āĻžāĻž): 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§‚āĻ°ā§āĻŖāϏāĻ‚āĻ–ā§āϝāĻžā§° āĻĒā§ā§°āĻ•āĻžā§°)


i. Negative Integers (āĻ‹āĻŖāĻžāĻ¤ā§āĻŽāĻ• āĻĒā§‚ā§°ā§āĻŖāϏāĻ‚āĻ–ā§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§‚āĻ¨ā§āϝ)



  • Example: 0

  • Meaning: Neither positive nor negative.

  • Zero separates positive integers from negative integers.

  • Example: No profit, no loss = 0


iii. Positive Integers (āϧāύāĻžāĻ¤ā§āĻŽāĻ• āĻĒā§‚ā§°ā§āĻŖāϏāĻ‚āĻ–ā§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§‚āĻ°ā§āĻŖāϏāĻ‚āĻ–ā§āϝāĻžā§° āĻŦ⧈āĻļāĻŋāĻˇā§āĻŸā§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§ŒāϞāĻŋāĻ• āĻ•ā§ā§°āĻŋāϝāĻŧāĻžāϏāĻŽā§‚āĻš)


Addition (āϝ⧋āĻ—): 5 + (−2) = 3


Multiplication (āϗ⧁āĻŖ): (−2) ×4 = −8 


Division (āĻ­āĻžāĻ—): 12 ÷ (−3) = − 4 


6. Number Line (āϏāĻ‚āĻ–ā§āϝāĻž ⧰⧇āĻ–āĻž)














←--------------------------------------------→

-5 -4 -3 -2 -1 0 1 2 3 4 5

Negative Integers Zero Positive Integers













Integers extend infinitely in both directions.


==================================================================


Integers MCQs


1. Which of the following is an integer ? (āύāĻŋāĻŽā§āύāϞāĻŋāĻ–āĻŋāϤ āϕ⧋āύāĻŸā§‹ āĻĒā§‚ā§°ā§āĻŖāϏāĻ‚āĻ–ā§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§āϝāĻžāĻ–ā§āϝāĻž: āĻĒā§‚ā§°ā§āĻŖāϏāĻ‚āĻ–ā§āϝāĻžāϤ āĻĻāĻļāĻŽāĻŋāĻ• āĻŦāĻž āĻ­āĻ—ā§āύāĻžāĻ‚āĻļ āύāĻžāĻĨāĻžāϕ⧇āĨ¤ -3 āĻāϟāĻž āĻĒā§‚ā§°ā§āĻŖāϏāĻ‚āĻ–ā§āϝāĻžāĨ¤


2. Which integer is neither positive nor negative ? āϕ⧋āύāĻŸā§‹ āĻĒā§‚ā§°ā§āĻŖāϏāĻ‚āĻ–ā§āϝāĻž āϧāύāĻžāĻ¤ā§āĻŽāϕ⧋ āύāĻšāϝāĻŧ, āĻ‹āĻŖāĻžāĻ¤ā§āĻŽāϕ⧋ 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§āϝāĻžāĻ–ā§āϝāĻž: āĻļā§‚āĻ¨ā§āϝ (0) āĻāĻ•āĻŽāĻžāĻ¤ā§ā§° āĻĒā§‚ā§°ā§āĻŖāϏāĻ‚āĻ–ā§āϝāĻž āϝāĻŋ āϧāύāĻžāĻ¤ā§āĻŽāϕ⧋ āύāĻšāϝāĻŧ, āĻ‹āĻŖāĻžāĻ¤ā§āĻŽāϕ⧋ āύāĻšāϝāĻŧāĨ¤


3. Which is a negative integer ? āϕ⧋āύāĻŸā§‹ āĻ‹āĻŖāĻžāĻ¤ā§āĻŽāĻ• āĻĒā§‚ā§°ā§āĻŖāϏāĻ‚āĻ–ā§āϝāĻž ?


a) 5  b) 0  c) -8  d) 9


Ans: c) -8


Explanation: Negative integers are numbers less than zero. āĻŦā§āϝāĻžāĻ–ā§āϝāĻž: āĻļā§‚āĻ¨ā§āϝāϤāĻ•ā§ˆ āϏ⧰⧁ āϏāĻ‚āĻ–ā§āϝāĻžāĻŦā§‹ā§° āĻ‹āĻŖāĻžāĻ¤ā§āĻŽāĻ• āĻĒā§‚ā§°ā§āĻŖāϏāĻ‚āĻ–ā§āϝāĻžāĨ¤


4. What is 4 + (-6) ?


a) 10  b) -2  c) 2  d) -10


Ans: b) -2


Explanation: 4 + (-6) = 4 - 6 = -2. āĻŦā§āϝāĻžāĻ–ā§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§āϝāĻžāĻ–ā§āϝāĻž: āĻ‹āĻŖāĻžāĻ¤ā§āĻŽāĻ• āϏāĻ‚āĻ–ā§āϝāĻž × āϧāύāĻžāĻ¤ā§āĻŽāĻ• āϏāĻ‚āĻ–ā§āϝāĻž = āĻ‹āĻŖāĻžāĻ¤ā§āĻŽāĻ• āϏāĻ‚āĻ–ā§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§āϝāĻžāĻ–ā§āϝāĻž: -7 ā§° āĻĒā§°āĻž 12 āϘ⧰ āϏ⧋āρāĻĢāĻžāϞ⧇ 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§āϝāĻžāĻ–ā§āϝāĻž: āĻ‹āĻŖāĻžāĻ¤ā§āĻŽāĻ• āϏāĻ‚āĻ–ā§āϝāĻž āĻŦāĻŋāϝāĻŧā§‹āĻ— āϕ⧰āĻž āĻŽāĻžāύ⧇ āϧāύāĻžāĻ¤ā§āĻŽāĻ• āϏāĻ‚āĻ–ā§āϝāĻž āϝ⧋āĻ— āϕ⧰āĻžāĨ¤ āϏ⧇āϝāĻŧ⧇ -9 + 4 = -5āĨ¤


8. What is (-8) × (-6) ?


a) -48  b) 48  c) -14  d) 14


Ans: b) 48


Explanation: Negative × Negative = Positive. āĻŦā§āϝāĻžāĻ–ā§āϝāĻž: āĻ‹āĻŖāĻžāĻ¤ā§āĻŽāĻ• × āĻ‹āĻŖāĻžāĻ¤ā§āĻŽāĻ• = āϧāύāĻžāĻ¤ā§āĻŽāĻ•āĨ¤


9. What is 36 ÷ (-9) ?


a) 4  b) -4  c) -45  d) 45


Ans: b) -4


Explanation: Positive ÷ Negative = Negative. āĻŦā§āϝāĻžāĻ–ā§āϝāĻž: āϧāύāĻžāĻ¤ā§āĻŽāĻ• ÷ āĻ‹āĻŖāĻžāĻ¤ā§āĻŽāĻ• = āĻ‹āĻŖāĻžāĻ¤ā§āĻŽāĻ•āĨ¤


10. Which statement is true ? āϕ⧋āύāĻŸā§‹ āĻŦāĻ•ā§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§āϝāĻžāĻ–ā§āϝāĻž: āĻļā§‚āĻ¨ā§āϝ āϧāύāĻžāĻ¤ā§āĻŽāĻ• āφ⧰⧁ āĻ‹āĻŖāĻžāĻ¤ā§āĻŽāĻ• āϏāĻ‚āĻ–ā§āϝāĻžā§° āĻŽāĻžāϜāϤ āĻ…ā§ąāĻ¸ā§āĻĨāĻŋāϤāĨ¤


Trick (āĻŸā§ā§°āĻŋāĻ•)



  • Positive + Positive = Positive (āϧāύāĻžāĻ¤ā§āĻŽāĻ• + āϧāύāĻžāĻ¤ā§āĻŽāĻ• = āϧāύāĻžāĻ¤ā§āĻŽāĻ•)

  • Negative + Negative = Negative (āĻ‹āĻŖāĻžāĻ¤ā§āĻŽāĻ• + āĻ‹āĻŖāĻžāĻ¤ā§āĻŽāĻ• = āĻ‹āĻŖāĻžāĻ¤ā§āĻŽāĻ•)

  • Positive × Negative = Negative (āϧāύāĻžāĻ¤ā§āĻŽāĻ• × āĻ‹āĻŖāĻžāĻ¤ā§āĻŽāĻ• = āĻ‹āĻŖāĻžāĻ¤ā§āĻŽāĻ•)

  • Negative × Negative = Positive (āĻ‹āĻŖāĻžāĻ¤ā§āĻŽāĻ• × āĻ‹āĻŖāĻžāĻ¤ā§āĻŽāĻ• = āϧāύāĻžāĻ¤ā§āĻŽāĻ•)