Regrouping, also known as carrying, is a technique used in addition when the total in one place value (like the ones or the tens) is 10 or greater. You simply take the 1 (like the 1 in 17) and add it to the next value place over to the left. This demonstrates that a number larger than 9 can be understood to be 10 + whatever is in the ones space.  To sum up, addition is a vital foundation for all math skills to follow. With a little bit of practice, you’ll soon understand this cornerstone of math and will soon be able to tackle more complex forms of arithmetic.