Question

find all the partial product. then add to find the final product 16×15

Answer 1

We can write the numbers as a sum of other number, so:

$\begin{gathered} 16\cdot15=(10+6)\cdot(10+5) \\ 16\cdot15=(10\cdot10)+(10\cdot5)+(6\cdot10)+(6\cdot5) \\ 16\cdot15=100+50+60+30 \\ 16\cdot15=150+90 \\ 16.15=240 \end{gathered}$