A product, kept in matC
A matrix answer can be kept and used again. Multiply mat A by mat B: press 
, 
, 
, , 
, , , 
, and 
. The product has the rows 5, 111, 258; then 7, 52, 79; then −5, 90, 289. The answer is in the entry screen. To keep it, press , then , 
, and 
: it is stored in mat C.