How do you know if you need to regroup?

How many types of species of apples are there? How many syllables are in decency? How many times does three go into twenty seven? How can you find the total number of numbers if you know their mean? Which numbers can not be written in roman numerals? Is theorems accepted without proof in a logical system in geometry? Name the two basics structures and describe their shape? Is every rhombus is a quadrilateral true or false? What does event mean in maths? How many dittos are on the surface of a basketball? How do you write 1013120? What does angle angle side mean? How do you solve disturbitive property solve for x? Can the atomic mass of an element change? What is the purpose of graphs? Is gogol bigger than infenidy? What is 102358 0124875257? How many polygons are in the net of a rectangular prism? What is the decimal fraction for 2.7? What do you get when you increase 40 by 85 percent?