Worksheets also, when used properly, provide both the students and parent / tutor immediate feedback as to the child's progress. This means they can be used to point out areas where the student needs further reinforcement.
Subtract 1- or 2-digit number from a 2-digit number with/without renaming
Review subtraction of 2 numbers whose sums would be 18 or less
They're also available for nearly all grade levels. There are printable middle school, high school, elementary school, and even pre-school worksheets.
math worksheets grade 1
math worksheets grade 7
math worksheets grade 5