Subtract within 20 without crossing 10

Subtract within 100 w/o crossing the 10

Subtract 2-digit #s without renaming

Subtract multiples of 10 within 1,000

Subtract within 20 w/o crossing 10 (2)

Subtract multiples of 10 from mult of 10

Subtract within 200 without renaming

Subtract multiples of 100 within 1,000

Subtract multiples of 10 within 40

Subtract multiples of 10 from 2-digit #s

Subtract 10 & 100 from 3-digit numbers

Subtract 3-digit #s without renaming