The answer to the riddle "From what number can you take half and leave nothing?" is the number 8, because when either the top or bottom half of the digit is removed, the remaining half forms the number zero, or nothing.
Another visual number riddle involving the number zero is "Why is the number 9 like a peacock?" The answer is because it is nothing without its tail. If you remove the tail from a number 9, the remaining circle is a zero. Another visual number riddle is "What is the difference between 100 and 1,000?" The answer is zero, because 100 has two zeros and 1,000 has three.Learn More
The reciprocal of a negative number is also a negative number because when the two numbers are multiplied the answer is 1. For example, the reciprocal of -6 is -1/6, and the product of these two numbers is -6 x (-1/6)= 1.Full Answer >
There are 90,000 different number combinations that can be made in a five-digit number if numbers can repeat. To determine the number of possibilities, each place digit has to be evaluated independently to see how many numbers could fit there and then all are multiplied together.Full Answer >
The greatest nine-digit number that can be made using nine different digits is 987,654,321. Using the number zero only makes the largest possible number smaller.Full Answer >
The last digit in any number is referred to as the estimated digit. In science, all other numbers are considered significant digits because they are precise measurements.Full Answer >