I have been learning to add using tidy numbers. Tidy numbers are numbers that end in a 0. Here is an Example.
The first question is 43 + 29. The first thing to do is to make a tidy number. We make a tidy number by adding 1 onto the 29 to make 30. Where does the one come from? We takeaway 1 from the 43 to make 42. 3 + 4 = 7 so 30 + 40 = 70 and adding two makes 72. Now you know what tidy numbers are, you can try use the strategie for yourself.