There are 90 four-digit numeral palindromes ranging from 1001 to 9999. There are also 90 three-digit palindromic numbers, 9 two-digit palindromes and 900 five- and six-digit numeral palindromes.
A palindromic number refers to a numeric value that remains unchanged when its digits are written backwards or forwards. Some examples of four-digit palindromes include 1001, 6886, 4334 and 9559. The term palindromic is derived from palindrome, which is also used to refer to words whose spelling remains the same when its letters are written backwards like "rotor" or "radar." Palindromes can be found in other numeral system other than decimal. There are several palindromic binary numbers, such as 1111 and 1001.Learn More
The two numbers that have a tens digit that is eight more than the ones digit are 80 and 91. Note that there are some larger numbers that also exhibit this pattern, such as 180, 280, 191 or 291.Full Answer >
A nine-digit number that is divisible by 2, 3, 4, 5, 6, 8, 9 and 10 is 518,400,000. This number is found by multiplying 2 x 3 x 4 x 5 x 6 x 8 x 9 x 10 x 10 x 10.Full Answer >
There are a total of 10,000 four-digit combinations using the numbers 0 to 9, assuming that 0 is allowed as the first digit and repetition of digits is allowed. Some of the possible combinations are 1911, 0000, 3145 and 2458.Full Answer >
The four fundamental operations in math are addition, subtraction, multiplication and division. There are corresponding symbols for each operation: the plus sign (+) for addition; the minus sign (-) for subtraction; the symbols “x”, “*” and “•” for multiplication; and the obelus (÷) and forward slash (/) for division.Full Answer >