Advertisements
Advertisements
प्रश्न
20 × 3 is a multiple of 3 if the digit × is ______ or ______ or ______.
Advertisements
उत्तर
20 × 3 is a multiple of 3 if the digit × is 1 or 4 or 7.
Explanation:
We know that, if a number is a multiple of 3, then the sum of its digits is again a multiple of 3, i.e. 2 + 0 + x + 3 is a multiple of 3.
x + 5 = 0, 3, 6, 9, 12, 15 But, x is a digit of the number 20 × 3.
x can take values 0, 1, 2, 3, ........ 9.
⇒ x + 5 = 6 or 9 or 12
Hence, x = 1 or 4 or 7
APPEARS IN
संबंधित प्रश्न
Without performing actual addition and division write the quotient when the sum of 69 and 96 is divided by
(i) 11
(ii) 15
Do you remember magic triangles? Come now, let s make some magic squares.
- Fill this square using all the numbers from 21 to 29.
Rule: The total of each side is 75.
Fill in the blank space in the same way.
Now, look at this —
Check if it is true or not.
The sum of a two-digit number and the number obtained by reversing the digits is always divisible by ______.
The difference of three-digit number and the number obtained by putting the digits in reverse order is always divisible by 9 and ______.
If 
then B = ______.
If A × 3 = 1A, then A = ______.
A four-digit number abcd is divisible by 4 if ab is divisible by 4.
If AB × 4 = 192, then A + B = 7.
