Children with ADHD (attention deficit hyperactivity disorder) can be hyperactive which can make it difficult to get to sleep. Bedtime can also be chaotic and stressful for parents.
Rational Numbers 5/1, 1/2, 1.75, -97/3 ... A rational number is any number that can be written as a ratio of two integers (hence the name!). In other words, a number is rational if we can write it as a fraction where the numerator and denominator are both integers.
A number that is equal to the sum of the digits of its cube? 8 is the same as the sum of the digits of its cube, 512. What is a 2-digit number the sum of whose digits is 1? The only 2 digit number that dts digits equal one is the number 10.