Mathematics interventions in middle and elementary school should devote about 10 minutes in each session to build fluent retrieval of basic facts. These worksheets are used as bell work or warm-ups in middle school math intervention classes to help students practice their basic skills. Mondays are addition problems, Tuesdays are subtraction, Wednesdays are multiplication, Thursdays are division, and Fridays cover a variety of skills � order of operations, fraction equivalence, fraction