The best replacement for digits is numbers.

The best alternatives to digits are rated as following:
★★★★★  numbers
★★★★★  fingers
★★  figures
★★  least whole number with 6 digits
★★  numerals
★  soulver
★  calcbot
★  digit
  significant figures
  clubbing of toes and fingers
  four digits it is okay to just use three digits
  definition

Your alternative for digits is not listed? Suggest!
Speaking about digits, one probably shouldn't forget about regrouping.

Other search terms related to digits and their ratings are:
★★★★★ regrouping
★★ adding
★ 2 digits
You have in mind a companion for digits and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of digits in all years. Click on graph for more.
digits
numbers
fingers