In the Holy Quran, God Almighty has expressed the inheritance shares of all heirs as fractions so that they can be calculated in different cases according to the rule of algebraic addition. The importance of applying algebraic addition in the issue of inheritance is twofold: If the sum of the fractional numbers of the shares is not equal to one, but is less or more than that, the shares of the heirs can be calculated. With algebraic addition, there is no need to apply rules such as awl, ta’isib, and redd to determine the amount of deficiency or excess. With this description, the aim of this article is to discover the necessity of applying the rule of algebraic addition in dividing the shares of the heirs’ inheritance, based on the implications of the verses of the Quran. Although some studies have been written in a comparative manner between the Quran and mathematical rules, the present study has the advantage of adapting some Quranic phrases in which the sum of the fractional shares of the heirs is more than one or less than one, contrary to the popular saying, to the rules of algebraic addition from the very beginning. To achieve this goal, the present article has selected, examined and explored the necessary samples and data using a descriptive-analytical method and library and document mining tools. The results obtained show that God has prioritized the rights of children over all heirs and has determined their share more than other heirs. Except in cases where God himself has specified it. ....