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1939392 * 625

  • 1212120010
  • 1212120000
  • 1212120011
  • 1212121010

Answer: Option B

Explanation:

Trick: when multiplying with 5n

then put n zeros to the right of multiplicand and divide the number with 2n

So using this we can solve this question in much less
time.
1939392×54=1939392000016=1212120000

Similar Questions :

1. Simplify 586645 * 9999

  • 5865863355
  • 5665863355
  • 4865863355
  • 4665863355

Answer: Option A

Explanation:

Although it is a simple question, but the trick is to save time in solving this.
Rather than multiplying it we can do as follows:
586645 * (10000 - 1) = 5866450000 - 586645 = 5865863355

2. 587 * 999 = ?

  • 586411
  • 586413
  • 486411
  • 486413

Answer: Option B

Explanation:

Trick: 587 * (1000 - 1) = 587000 - 587 = 586413

3. What least number must be subtracted from 427398 so that remaining number is divisible by 15

  • 3
  • 5
  • 7
  • 9

Answer: Option A

Explanation:

On dividing 427398 by 15 we get the remainder 3, so 3 should be subtracted

4. How many terms are there in 2,4,8,16,....,1024

  • 7
  • 8
  • 9
  • 10

Answer: Option D

Explanation:

It is a GP. with r = 2, ie 21,22,23...


If number of terms is n. Then,
2×2n−1=1024
=>
2n−1=512

or 2×2n−1=29

so n-1 = 9 => n = 10

5. 462−(?)2=4398−3066

  • 23
  • 18
  • 38
  • 28

Answer: Option D

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