The first unit was about numbers. In specific there was prime numbers, radicals, and number system.  In prime number section, we have learned that prime numbers are numbers which is one and itself. We would do prime factorization to figure out the factors and determine if it was a prime number or not. The next section was about radicals, we learned about changing the whole radical to mixed radical and mixed radical to whole radical. Also, we have learned about square root and cube root. Last thing is about the real number system. In real number system, numbers can be divided to rational and irrational. In irrational, there would be roots and pi. When you describe it in a diagram, there will be few sets of numbers included as rational  : integers, whole numbers, and natural numbers.