Speaking of counting to 100, for some reason for the last five years a number of schools throughout Pittsburgh [and the United States and elsewhere judging from the Internet] make a big deal about the first 100 day of school. During that day, students are supposed to do some activity that revolves around the number 100.
Here is an arbitrary sample of the activities:

46. Help students learn a game that children played 100 years ago.
47. Challenge kids to find out what a group of 100 parrots, 100
    whales, 100 skunks, or 100 lions is called. They can make a book
    of animal groups.
48. Ask each student to write 100 on a piece of drawing paper and
    incorporate the numeral into a drawing.
49. Have kids put 100 words in alphabetical order.
50. Invite someone 100 years old to visit the classroom.
51. Challenge kids to do 100 jumping jacks.
52. Ask students to find out who was president of the United States
    100 years ago.
53. Challenge students to think of as many addition problems as they
    can with a sum of 100.
54. Have kids estimate which classroom items, or groups of items,
    weigh 100 pounds and check their estimates.
55. Can students predict 100 things that will be invented during the
    next 100 years?
56. Ask children to make as many words as possible using the letters
    in the words one hundred.
57. Time students as they jump rope 100 times.
58. Assign a number, from 1 to 26, to each letter of the alphabet.
    Does anyone's name add up to 100?
59. Ask kids to find the numeral 100 in today's newspaper. How many
    times does it appear?
60. Play a circle game. The first child begins, "I went to the zoo
    and I saw one giraffe." The second child continues, "I went to
    the zoo and I saw one giraffe and two bears." Can students reach
    100?
61. Ask children to guess which container -- of pennies, golf tees,
    jelly beans, thumbtacks, etc. -- has 100 in it.
62. Have kids write their names using 100 paper dots.
63. Read One Hundred Eggs, One Hundred Children, a Vietnamese
    folktale, to your class.
64. With kids, make a 100th day snack, using 100 raisins, 100 M&Ms,
    100 pieces of cereal, 100 banana slices, and so on.
65. Play bingo with your class, using a 100s chart.
66. Challenge students to tell 100 jokes.


Oops! I had to go away from the computer for a bit & somehow got bumped off of Mudcat. Thankfully I had saved this list in Word cause I can't find the website it was on..[what's up with that???!!!]

But here is another website with kindergarten songs about the first 100 days..

100 Day songs

Since we act like kids sometimes [which is good!!] maybe we can use the folk process to modify some of these songs when we reach the 100th post or whenever we want to say we reached it.