Compare the following numbers and find the greatest among them: āϤāϞāϤ āĻĻāĻŋāϝāĻŧāĻž āϏāĻ‚āĻ–ā§āϝāĻžāĻŦā§‹ā§° āϤ⧁āϞāύāĻž āϕ⧰āĻ• āφ⧰⧁ āφāϟāĻžāχāϤāĻ•ā§ˆ āĻĄāĻžāϙ⧰ āϏāĻ‚āĻ–ā§āϝāĻžāĻŸā§‹ āύāĻŋā§°ā§āĻŖāϝāĻŧ āϕ⧰āĻ•āσ 2^120, 3^75, 5^60, 7^45


Q: Compare the following numbers and find the greatest among them: 2120, 375, 560, 745


Easy Trick: Convert to “same exponent form”


We try to write each number as (something)common exponent


1st: Factor the exponents if possible



  • 2¹²â° → 2¹²â° = (2⁸)¹âĩ = 256¹âĩ

  • 3⁡âĩ → 3⁡âĩ = (3âĩ)¹âĩ = 243¹âĩ

  • 5âļ⁰ → 5âļ⁰ = (5⁴)¹âĩ = 625¹âĩ

  • 7⁴âĩ → 7⁴âĩ = (7³)¹âĩ = 343¹âĩ


Now all numbers are of the form: (base)15


2nd: Compare the bases : 256, 243, 625, 343 → Clearly 625 is the largest.


3rd: Conclude : 560 = 62515 is the largest number.


Why this trick works:



  • If powers are all equal, the largest base gives the largest number.

  • So just factor the exponents to make them the same, then compare bases.


Ans: 560


āĻĒā§ā§°āĻļā§āύ: āϤāϞāϤ āĻĻāĻŋāϝāĻŧāĻž āϏāĻ‚āĻ–ā§āϝāĻžāĻŦā§‹ā§° āϤ⧁āϞāύāĻž āϕ⧰āĻ• āφ⧰⧁ āφāϟāĻžāχāϤāĻ•ā§ˆ āĻĄāĻžāϙ⧰ āϏāĻ‚āĻ–ā§āϝāĻžāĻŸā§‹ āύāĻŋā§°ā§āĻŖāϝāĻŧ āϕ⧰āĻ•āσ


2120, 375, 560, 745


Easy Trick: Convert to the Same Exponent Form (āϏāĻšāϜ āĻŸā§ā§°āĻŋāĻ•: āϏāĻ•āϞ⧋ āϏāĻ‚āĻ–ā§āϝāĻžāĻ• āĻāϕ⧇ āϘāĻžāϤāϤ āϞāĻŋāĻ–āĻž)


1st: Factor the exponents if possible (āĻĒā§ā§°āĻĨāĻŽā§‡ āϘāĻžāϤāĻŦā§‹ā§° āĻ­āĻžāĻ™āĻŋ āĻāϕ⧇ āϘāĻžāϤ āĻŦāύāĻžāĻ“āρ)


·  = (28)15 = 25615


·  375 = (35)15 = 24315


·  560 = (54)15 = 62515


·  745 = (73)15 = 34315


Now all numbers are of the form (base)15


(āĻāϤāĻŋāϝāĻŧāĻž āϏāĻ•āϞ⧋ āϏāĻ‚āĻ–ā§āϝāĻž āĻāϕ⧇āχ āϘāĻžāϤ (15) āϤ āφāϛ⧇)


Compare the bases (āĻāϤāĻŋāϝāĻŧāĻž āĻ•ā§‡ā§ąāϞ āĻ­āĻŋāĻ¤ā§āϤāĻŋ āϤ⧁āϞāύāĻž āϕ⧰⧋āρ)


Bases: 256, 243, 625, 343


Clearly, 625 is the largest base (āĻ¸ā§āĻĒāĻˇā§āϟāĻ­āĻžā§ąā§‡ 625 āφāϟāĻžāχāϤāĻ•ā§ˆ āĻĄāĻžāϙ⧰)


Conclusion (āωāĻĒāϏāĻ‚āĻšāĻžā§°)


560 = 62515 is the largest number.


 āĻŸā§ā§°āĻŋāĻ•:


If powers are equal, the number with the largest base is the greatest. So we make all exponents the same and then compare only the bases.āϝ⧇āϤāĻŋāϝāĻŧāĻž āϏāĻ•āϞ⧋ āϏāĻ‚āĻ–ā§āϝāĻžā§° āϘāĻžāϤ āĻāϕ⧇ āĻšāϝāĻŧ, āϤ⧇āϤāĻŋāϝāĻŧāĻž āϝāĻžā§° āĻ­āĻŋāĻ¤ā§āϤāĻŋ āĻĄāĻžāϙ⧰, āϏ⧇āχ āϏāĻ‚āĻ–ā§āϝāĻžāχ āĻ¸ā§°ā§āĻŦāĻžāϧāĻŋāĻ• āĻšāϝāĻŧāĨ¤ āϏ⧇āϝāĻŧ⧇ āϘāĻžāϤāĻŦā§‹ā§° āĻāϕ⧇ āϕ⧰āĻŋ āĻ•ā§‡ā§ąāϞ āĻ­āĻŋāĻ¤ā§āϤāĻŋ āϤ⧁āϞāύāĻž āϕ⧰āĻŋāϞ⧇āχ āĻšāϝāĻŧāĨ¤


Ans / āωāĻ¤ā§āϤ⧰ :