Question

Corinne has to solve 10 x 8 and 5 x 16. a What observations can you share with Corinne about these problems to help her solve them? b How would How would you tell or show Corinne how to solve these problems? C Solve 10 x 8 and 16 x 5.

Answer 1

And

Observation; the product of the two questions are the same.

the product of 10 and 8 can be calculated by writing one zero to right of 8, so that 8 moves from units to tens and becomes 80.

Also the product of 5 and 16 can be calculated by dividing 16 by 2 and then multiply the result by 10.

$\begin{gathered} 16\times5 \\ =16\times\frac{10}{2} \\ =\frac{16}{2}\times10 \\ =8\times10 \\ =80 \end{gathered}$