$0.59/sprint
Subtract within 20 without crossing 10
Subtract within 20 without crossing 10 (2)
Subtract multiples of 10 within 40
Subtract within 100 w/o crossing the 10
Subtract multiples of 10 from mult of 10
Subtract mult of 10 from 2-digit numbers
Subtract 2-digit #s without renaming
Subtract within 200 without renaming
Subtract 10 & 100 from 3-digit numbers
Subtract multiples of 10 within 1,000
Subtract multiples of 100 within 1,000
Subtract 3-digit #s without renaming