Two digit addition

12345
Across
  1. 3. which place do we add first?
  2. 4. If the sum in the ones column is 23, which digit do we carry to the tens place?
  3. 5. If the sum in the ones place is 23, how many ones does it have?
Down
  1. 1. What is 23+17?
  2. 2. we _ 10 ones for 1 ten
  3. 4. 10 ones makes 1_