I would print the cards representing units in a particular period the same color. More Place Value Ideas - FREE printable - Example on extending learning beyond an ipad game with the use of FREE printable resource
Telling Time Bingo Game (to the hour and half hour). This game would be a fun and easy way to work on telling time. Telling time is a large math concept that comes in first grade and this activity would help make it more enjoyable for the first graders.
How To Manage Students Who Are Demanding Your Attention
Holiday FREEBIE -Are you a middle school or elementary teacher who is frustrated by lines of students wanting your attention? You are going to want to check out this post containing an easy strategy that both you AND your substitute teachers will love!