I’ve often tried to use MS Word tables and do computations with the values in the tables. Example:

a0 b0 c0
a1 b1 c1
a2 b2 c2
a3 b3 c3

Suppose, the following conditions hold true:
c1 = a1xb1
c2 = a2xb2
a3 = a1 + a2
b3 = b1 + b2
c3 = c2 + c2

Click on the c1 cell, click on the “Layout” button, click on “Formula” button, in the Formula field, enter the following:
Similarly, for c2 use =PRODUCT(a2:b2).
For a3,b3,c3 use =SUM(ABOVE)