This mathematics document contains 5 problems involving factors of natural numbers, consecutive and non-consecutive even and odd numbers adding to certain values. The first problem asks to list factors, identify numbers with two factors, and numbers less than 22 with a given property. The second asks to list factors of a given number. The third involves writing consecutive even and odd numbers. The fourth finds non-consecutive even/odd numbers adding to 10/20 and even numbers adding to 20. The fifth completes sentences using "even" and "odd".