$1$ Maria is practicing solving problems using the standard algorithm for multiplication. She knows the first step, but then she gets stuck. Finish these problems Maria started.

$2$ Fill in the boxes to complete the problems.

$3$ Conrad always likes to use the standard algorithm. He has to solve $9938.$ Can you recommend another strategy to Conrad that might be more efficient? Explain.

$4$ CHALLENGE Lydia also likes to use the standard algorithm for multiplication. She has to solve $328\mathrm{.}25.$ Recommend another strategy to Lydia, and show her how to use that strategy to solve this problem.