Addition and Subtraction: Add and Subtract on a Number Line (Totals to 20) Concept/s in Focus: 👉 Addition is joining quantities (parts) together to make a total (part part = total) 👉 Make Ten addition basic facts are pairs of numbers that add to make a total of ten e.g. 6 4. 👉 Make Ten subtraction basic facts involve a 1-digit number subtracted from ten e.g. 10-5. The number being subtracted and the answer make a total of ten (addition make ten facts i.e. 5 5) 👉 When adding two 1-digit numbe