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Find a four digit number that you can multiply by 4 and get a number with the original digits in reverse order?
Original number is 1000a + 100 b + 10c + d, and a must be 2, If it were 3 or more then multiplying be 4 would give a 5-digit number, and it can't be 1 because it is the units figure in the multiplied number and 1 can't be the last digit in a multiple of 4.
Similarly d must be 3 or 8 to give a number ending in 2 when multiplied by 4,and can't be 3 'cos no multiple of 4 ends in a 3...
Four times original is 4000a + 400b + 40c +4d which equals 1000d + 100c + 10b + a
so 3999a + 390b = 60c + 996d which simplifies to
1333a + 130b = 20c + 332d.
a = 2, d = 8, then 20c - 130b = 2666 - 2656.
20c - 130b = 10 so c = 7 and b = 1
The original number is 2178 (x 4 = 8712)
Whew!
What else can I help you with?
The sum of the digits in a two digit number is 11 If the digits are reversed the new number will be 45 less than the original number What is the original number?
Possibility of two digit no whose sum is 11 Are 29,38,47,56,65,74,83,92 Subract 45 to each no mentioned above -16,-7,2,11,20,29,38,47 See after 6th comma 83 and 38 Reverse of 83 is 38. The no 38 is 45 less than 83. Original no is=83
The sum of the digits of a two digit number is 9 If the digits were reversed the new number would be 9 more than the original number Find the original number?
Possibility of two digit no whose sum is 9 18,27,36,45,54,63,72,91 Now add 9 to each no mentioned above 27,36,45,54,63,72,91,100 See after third comma 45 and 54. If you reverse 45 it will be 54. which is 9 more than 45. So original no is 45
Four times the sum of the digits of a two-digit number is equal to the number if the digits are reversed the resulting number is 27 greater than the original number what is the number?
The number is 36
How do you find out percent if you have original amount and new amount?
First you subtract the new number from the original number then divide it by the original number and multiply that by 100 original-new __________*100 original
When you have to reverse the inequality sign?
The usual case is when you multiply or divide an inequality by a negative number.
What is a four digit number that you can multiply by 4 and get a number with the original digits in reverse order?
2178 x 4 = 8712
I am a three digit number. The sum of my digits is 18. When I reverse my digits and subtract the new number from the original number you get 99. What number I am?
whats the answer please??
How to multiply numbers while considering significant digits?
When multiplying numbers with significant digits, count the total number of significant digits in each number. Multiply the numbers as usual, but round the final answer to match the least number of significant digits in the original numbers.
If 27 is added to a twi digit number the result is a number with the same digits but in reverse order The sum of the digits is 11 What is the original number?
38
How do you know that a numeric is palindrome or not using c or pascal language?
Reverse the digits then check of the new number is the same as the original number.
The sum of the digits in a two digit number is 17 If the digits are reversed the new number will be 9 less than the original number What is the original number?
To total 17 the two digits must be 8 and 9! The original number was 98.
What is the 11 finger trick and how does it work?
The 11 finger trick is a math trick where you can quickly multiply numbers by 11. To use the trick, you separate the digits of the number you want to multiply by 11, add the two digits together, and place the result in between the original digits. This works because 11 is the same as 10 1, so when you add the two digits together and place the result in between, you are essentially multiplying the original number by 10 and then adding the original number to it.
How to check the divisibility by 23?
Multiply the last digit by 7. Subtract that number from the remaining digits. If that number is divisible by 23, then the original number is divisible by 23.
What five digits number when you multiply by four is the same the number when you reversed it?
five digits number when you multiply by four is the same the number when you reversed it is 21978*4 = 87912
Can you explain the 11 finger trick in detail?
The 11 finger trick is a mental math technique where you can quickly multiply numbers by 11. To use this trick, you separate the digits of the number you want to multiply by 11, add the digits together, and place the sum in the middle of the original number. This allows you to calculate the product of the original number and 11 without using traditional multiplication methods.
What number can multiply all numbers or digits?
the number one.
Could you please tell me the Palindrome number checking code?
The most efficient method is to reverse the digits in the number and then check if the reversed number is equal to the original number. In C, we can implement this as follows (using long-hand notation for clarity). Note the use of base (defaulting to base 10) so that we can check values in other bases. bool is_palindrome (unsigned num, unsigned base = 10) { // local variables unsigned rev, digit, digits; // copy the input number digits = num; // initialise the accumulator rev = 0; // repeat while there are digits while (digits) { // extract the low-order digit using modulo (%) operator digit = digit % base; // shift the accumulated digits (if any) one position to the left rev = rev * base; // add on the new digit rev = rev + digit; // shift the remaining digits one position to the right digits = digits / base; } // end while // return true if the number and its reverse are equal return num == rev; }
