By the end of 2nd grade students should be able to use analog and digital clocks to tell time to the nearest 5 minutes. They also learn to tell if the time is a.m. or p.m. Below are several resources you can use for practicing these skills with your child at home. One important concept to discuss with your child is how the hour hand is in different locations for times such as 3:00, 3:15 and 3:45. The "Make Your Own Clock" is a great way for your child to get hands-on practice manipulating the hour and minute hands to show various times. Finally, as your child continues to deepen his understanding of telling time, be sure to take advantage of real-world opportunities such as checking the clock in the family room to know when 8:15 bedtime arrives or that it's 5:50 and you need to leave for gymnastics practice.
This video does a great job explaining the concept of between a.m. and p.m.
The first 12 hours in a day from midnight until right before noon are considered a.m. The second 12 hours in a day from noon until right before midnight are considered p.m.