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Understanding time is an important math skill for first graders to master. In the U.S., we use the 12-hour clock. This means we divide the 24 hours into two periods: a.m. (before noon) and p.m. (after noon). Use this worksheet to help introduce this concept to your students by having them read sentences and determine if the events happened in the a.m. or the p.m. Once they complete this worksheet, they will have a better understanding of time and their own schedules!