If your child is fluent with numbers and getting to grips with times tables, this is the next set of building blocks.
Tens and ones get us a long way, but numbers also have a shape. Arrange a number into equal rows and it becomes a rectangle, and the rectangles a number can make show how it is put together. Some numbers make lots of rectangles; a few stubborn ones make only a line. Seeing numbers as rows and columns is how times tables start to make sense, rather than being a list of facts to remember.