subtractions_within_ten_4
subtractions_within_ten_3
subtractions_within_ten_2
subtractions_within_ten_1
subtractions_from_(11-20)_3
subtractions_from_(11-20)_4
subtractions_from_(11-20)_5
subtractions_from_(11-20)_2
subtractions_from_(11-20)_1
subtractions_within_twenty_5
subtractions_within_twenty_4
subtractions_within_twenty_3
subtractions_within_twenty_2
subtractions_within_twenty_1
subtractions_within_ten_3
subtractions_within_ten_4
subtractions_within_ten_5
subtractions_within_ten_2
subtractions_within_ten_1
subtractions_from_(11-20)_5
subtractions_from_(11-20)_4
subtractions_from_(11-20)_3
subtractions_from_(11-20)_2
subtractions_from_(11-20)_1
subtractions_within_twenty_5
subtractions_within_twenty_4
subtractions_within_twenty_2
subtractions_within_twenty_3
subtractions_within_twenty_1
subtractions_within_ten_4
