Big addition sums, with tens of contributing numbers to be added up, are an integral part of any business, any association or even any household. Assam-Adder, tailor-suited for just this need, is an intuitive, as if on-paper, 40-number adder calculator that can add up to forty contributing later-modifiable terms, whether very large (up to several billions) or very small (up to a few millionth parts of one). There are also special provisions for multiple occurrences of the same term within a given calculation. Any earlier addition problem, in any one of its past modifications, may be instantly located & recalled here, so as to be re-calculated or further modified. This facility is particularly useful for businesses and organizations needing to recall old calculations. In Assam-Adder, text version of any current or even any past calculation may also be immediately obtained as a session report, which may be copied to any word-processor document and then easily formatted and/or printed. In v2.2, one may even keep blank (instead of the auto-displayed default 1) the space for the right-side multiplier factor for a number that indicates how many times (i.e., 1, 2 or 3 etc.) that number appears in the overall addition problem. Even if the factor is thus kept blank, itll now be counted as 1 (not as 0).