2178
27
Prime numbers that are still prime after their digits are reversed, like (13,31)(17,71)(37,73)(79,97)(107,701)(113,311)
22 x 30
500
The first four digits, written backwards, will be 141.3. The reversed version of pi rounded to 4 digits will be 241.3
five digits number when you multiply by four is the same the number when you reversed it is 21978*4 = 87912
after 11yrs.
11yrs.
An eight digit number with one zero cannot remain the same when its digits are reversed. It must have an even number of 0s.
If the number with the digits reversed can have a leading 0 so that it is a 1-digit number, then 16. Otherwise 13.
27
Find a four digit number whose digits will be reversed when multiplied by nine?
47 Impossible problem!
Prime numbers that are still prime after their digits are reversed, like (13,31)(17,71)(37,73)(79,97)(107,701)(113,311)
The minimum number of years that can pass before the double digits in someone's age can be reversed is 12.
45
The first 5 digits of pie are 3.1415"Product" is the result of an multiplication problem, meaning you must multiply them together.3*1*4*1*5The answer is 60.