I created this sutraction mental math worksheet to see where my students are at teh beginning of the school year with their mental math skills. This can be used as pre-assessment, practice worksheet, seatwork during math centers, homework or morning work. Also, please visit my TPT store and check out my mental math (generic) subtraction and addition, as well as my mental math addition and subtraction worksheets for the different seaons and holidays, including Back to School and Fall Mental Math Addition. Thanks!!