15 no prep mental math slide show quizzes (20 questions each), for Grade 3 & 4, in 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 assessment, mental math warm ups / starter activities, bell ringers, morning work, sub lessons, etc. Concepts include: Addition, Subtraction, Multiplication and Division, Times Tables, Doubling and Halving, Multiplying and Divid