Dr. Sigma's Life Lessons are short math warmups that involve everyday tasks that students will need to understand as they grow up and become responsible citizens. Life Lessons - Paychecks contains 16 warmup sheets for students that involve calculating gross pay, deductions and net pay for individual paychecks.. The warmups increase in difficulty. There are four warmups for each of the following levels of difficulty which build upon the difficulty of the previous levels:- Level 1, Calculation o