How can I teach important math concepts during calendar time? You can with Calendar Keepers and Activities SPRING BUNDLE! Bright, bold Calendar Keepers for three months! March, April and May. Teach calendar, patterns, counting, tally marks, and more with these colorful theme keepers. The calendar keepers are designed to fit in your calendar pocket chart. These calendar keepers are for 3 different months and each month has a pattern to display on your calendar. Bold black numbers and each c