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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. A number when divided by the sum of 555 and 445 gives two times their difference as quotient and 30 as remainder. The number is

  • 22030
  • 220030
  • 23030
  • 24030

Answer: Option B

Explanation:

(555 + 445) * 2 * 110 + 30 = 220000 + 30 = 220030

2. Which is smallest prime number

  • 0
  • 2
  • 3
  • 7

Answer: Option B

3. 217 * 217 + 183 * 183

  • 70578
  • 82578
  • 80578
  • 80568

Answer: Option C

Explanation:

12×2(a2+b2)=12×[(a+b)2+(a−b)2]


=12×[(217+183)2+(217−183)2]=80578

4. 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

5. 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

Read more from - Numbers Questions Answers
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