Start at -7, subtract 9 each time:

  _____   _____   _____   _____   _____      -7  -16  -25  -34  -43

 
 Start at -3, subtract -3 each time:

  _____   _____   _____   _____   _____      -3  0  3  6  9

 
 Start at 6, subtract 4 each time:

  _____   _____   _____   _____   _____      6  2  -2  -6  -10

 
 Start at 0, subtract 2 each time:

  _____   _____   _____   _____   _____      0  -2  -4  -6  -8

 
 Start at 6, subtract -1 each time:

  _____   _____   _____   _____   _____      6  7  8  9  10

 
 Start at 9, subtract 7 each time:

  _____   _____   _____   _____   _____      9  2  -5  -12  -19

 Lines = 6  Problems = 30 Number Correct _____ Number Wrong _____