1. Dividing with Base Ten Blocks

2. Ex # 1 23  3 Finding how many subsets – repeated subtraction 23 is 2 longs and 3 units. There are no 3’s in 2 longs, so exchange the 2 longs for 20 units.

3. Ex # 1 23  3 Finding how many subsets – repeated subtraction I now have 23 units.

4. Ex # 1 23  3 Finding how many subsets – repeated subtraction Make groups of 3 units. I have 7 groups of 3 units with 2 units left over. 23  3 = 7 r 2

5. Ex # 2 23  3 Finding how many in each subset – sharing 23 is 2 longs and 3 units. I want to share the pieces equally among 3 groups. I can’t share the 2 longs with 3 groups, so I exchange the 2 longs for 20 units.

6. Ex # 2 23  3 Finding how many in each subset – sharing I now have 23 units. Give each group 1 unit.

7. Ex # 2 23  3 Finding how many in each subset – sharing Give each group a 2 nd unit.

8. Ex # 2 23  3 Finding how many in each subset – sharing Give each group a 3 rd unit.

9. Ex # 2 23  3 Finding how many in each subset – sharing Continue this until all the units are given out. Each group has 7 units and there are 2 units left over. 23  3 = 7 r 2

10. Ex # 3 221  3 Finding how many subsets – repeated subtraction 221 is 2 flats, 2 longs, and 1 unit. There are no 3’s in 2 flats, so exchange the 2 flats for 20 longs.

11. Ex # 3 221  3 Finding how many subsets – repeated subtraction I now have 22 longs and 1 unit.

12. Ex # 3 221  3 Finding how many subsets – repeated subtraction Make groups of 3 longs. I have 7 groups of 3 longs and 1 long and 1 unit remaining. Exchange the 1 remaining long for 10 units.

13. Ex # 3 221  3 Finding how many subsets – repeated subtraction I now have 7 groups of 3 longs and 11 units.

14. Ex # 3 221  3 Finding how many subsets – repeated subtraction Make groups of 3 units. I now have 7 groups of 3 longs and 3 groups of 3 units and 2 units remaining. 221  3 = 73 r 2

15. Ex # 4 221  3 Finding how many in each subset – sharing 221 is 2 flats, 2 longs, and 1 unit. I want to share the pieces equally among 3 groups. I can’t share the 2 flats with 3 groups, so I exchange the 2 flats for 20 longs.

16. Ex # 4 221  3 Finding how many in each subset – sharing I now have 22 longs and 1 unit.

17. Ex # 4 221  3 Finding how many in each subset – sharing Give each group an equal number of longs. Each group has 7 longs and there is 1 long and 1 unit remaining.

18. Ex # 4 221  3 Finding how many in each subset – sharing Exchange the 1 remaining long for 10 units. I now have 11 units remaining to be distributed.

19. Ex # 4 221  3 Finding how many in each subset – sharing Give each group an equal number of units. Now each group has 7 longs and 3 units and there are 2 units remaining. 221  3 = 73 r 2