Do each of the following additions with the two-color counters. Draw a sketch of your addition for
problems 1 and 2; on the other problems use the counters to add and write your answer on this paper. Do not use a calculator on any of this exercise.

1. 4 + 3 = _____ 2. 5 + 4 = _____



3. 6 + 1 = _____ 4. 8 + 3 = ______ 5. 4 + 6 = _______




6. State a rule for adding two positive numbers. _________________________________

_____________________________________________________________________


Add the following without using counters.

7. 121 + 357 = ________ 8. 432 + 974 = ________

9. 713 + 99 = _________ 10. 38 + 1705 + 938 = _________



Do each of the following additions with the two-color counters. Draw a sketch of your addition for problems 11, 12, and 13: on the other problems use the counters to add and write your answer on this paper.

11. -6 + (-2) = ________ 12. -9 + (-3) = ________





13. -6 + (-7) = _________ 14. -4 + (-8) = _________





15. -7 + (-7) =________ 16. -9 + (-6) = ________ 17.12 + (-2) = ________



18. - 5 + (-7) = ________ 19. -10 + (-5) = _______ 20. -8 + (-9) = ________



21. Write a rule for adding two negative numbers. ______________________________________

___________________________________________________________________________


Add the following without using the counters.

22. -345 + (-65) = ________ 23. -973 + (-1470) = _________



24. - 91 + (-37) + (-54) = _________ 25. -863 + (-45) + (-702) = ________



26. -1976 + (-3674) = _________ 27. -935 + (-748) = _________



Do each of the following additions with the two-color counters. Draw a sketch of your addition for
problems 28 - 33; on the other problems use the counters to add and write your answer on this paper.

28. -6 + 9 = _________ 29. 8 + (-4) = _________




30. -9 + 10 = _________ 31. 7 + (-11) = _________




32. -7 + 10 = _________ 33. 4 + (-9) = _________




34. -8 + 7 = _________ 35. -2 + 2 = _________ 36. 4 + (-13) = ________

37. -7 + 12 = ________ 38. 16 + (-3) = ________ 39. -16 + 3 = ________

40. -9 + 12 = ________ 41. 9 + (-12) = _________



42. Write a rule for adding a positive number and a negative number. _______________________

_________________________________________________________________________



Add the following without the use of the counters.

43. -150 + 423 = ______ 44. 243 + (-984) = ______ 45. 641 +(-28)=______

46. -46 + 98 = _______ 47. -73 + 61 = _______ 48. 73 + (-61) = ______

49. -136 + 79 = ______ 50. -79 + 136 = _______ 51. 88 + (-49) = ______


Add the following. You may use the rules you wrote or the counters. You may draw sketches (if you prefer) of the counters. However, you may not use a calculator.

52. 4 + (-12) = ______ 53. -l l + 32 = ______ 54. (-15) + 13 = ______

55. -7 + 20 = _______ 56. -18 + (-23) = _______ 57. -12 + 14 = _______

58. 31 + 43 = _______ 59. -9 + 62 = _______ 60. 83 + (-19) = ______

61. 37 + 49 = _______ 62. -37 + 49 = ______ 63. 37 + (-49) = ______

64. -37 +(-49) = ______ 65. 49 + (-37) = ______ 66. -49 + 37 = ______