Chapter 1 - Whole Numbers - 1.3 Subtracting Whole Numbers - 1.3 Exercises - Page 28: 35

45

4 is less than 9, so in order to subtract we first have to regroup from the tens digit to turn 4 to 14. Then we subtract 14-9 = 5 for the ones column, and we subtract 8-4 = 4 for the tens column. From the 4 in the tens place and 5 in the ones place, we get 45.