Speaker: Addition is the process of adding 2 or more numbers or amounts together to get a total. If I start on the ground floor I've got to go up 9 floors to get to the top. That's 0 add 9, which ...

Subtracting larger numbers in your head is not always easy, so you can use the column method to take one number away from another. You write the larger number above the smaller number, so that the ...