Count backward from 15. What numbers come next?

15, ___, ___, ___

Count backward from 31. What numbers come next?

31, ___, ___, ___

Count backward from 81. What numbers come next?

81, ___, ___, ___

Count backward from 19. What numbers come next?

19, ___, ___, ___

Count backward from 34. What numbers come next?

34, ___, ___, ___

Count backward from 75. What numbers come next?

75, ___, ___, ___

Count backward from 84. What numbers come next?

84, ___, ___, ___

Count backward from 47. What numbers come next?

47, ___, ___, ___

Count backward from 61. What numbers come next?

61, ___, ___, ___

Count backward from 12. What numbers come next?

12, ___, ___, ___

Count backward from 90. What numbers come next?

90, ___, ___, ___

Count backward from 23. What numbers come next?

23, ___, ___, ___

Count backward from 28. What numbers come next?

28, ___, ___, ___

Count backward from 99. What numbers come next?

99, ___, ___, ___

Count backward from 39. What numbers come next?

39, ___, ___, ___