Mental Math Practice & Number Sense: Dividing & Rounding Rules, Calculating Tip Math BUNDLE • Mixed-level Montessori-inspired printable Extra Math help (10 printable pages + key):These quick, little Extra Mental Math Exercises go over:Review the most common rules for Divisibility (2, 5, 10, 25)Practice the standard rule for Rounding (whole numbers, decimal & mixed numbers)Explore a quick shortcut to calculating 10% and 20% of a number. How does memorizing rules help us with mental math? Here are