15 no prep mental math slide show quizzes (20 questions each), originally designed for 5th and 6th Grade. May suit high ability 4th Grade too. PowerPoint with an alternative PDF version. Provides 15 weeks of mental calculation practice (1 quiz per week) to boost students' calculation speed and mental agility. Ideal for informal assessments, regular mental math starter or warm up activities, bell ringers, morning work, sub lessons etc. Concepts include: Addition, Subtraction, Multiplication, Di