42 = 40 + 2 42 = 4 TENS + 2 ONESExpanded notation is a way of writing a number to show how many tens and how many ones make up the number. You can also do these problems backwards like this: 40 + 2 = 42
42 = 40 + 2 42 = 4 TENS + 2 ONES
NOTE: Make up a few more problems (backwards ones and forwards ones) like the one shown on this page for the student to work practice before going on to the activity.