"Number facts" refers to information or knowledge about numbers. It includes things like addition, subtraction, multiplication, division, and the relationships between numbers. Full definition
Students develop speed and accuracy in number facts, so that they can access more complex concepts like order of operations and connecting the equations, tables, and graphs of functions. (dreambox.com)
I have also included some basic number facts in there to make the test more accessible to them before they reach the angle questions. (tes.com)
The report also finds that teachers should help pupils to use a range of mental and other methods and be able to recall number facts efficiently and quickly. (educationbusinessuk.net)