standard_description: Explain each step in solving a simple equation as following from the equality of numbers asserted at the previous step, starting from the assumption that the original equation has a solution. Construct a viable argument to justify a solution method.
problem_activity: Solve. Show or explain your work.
a.
$${4 \times 3{7\over8}}$$
b.
$${2\times 6{2\over5}}$$


aligns: no