With the 100th day of the calendar year coming up soon, I thought I would post a few more ideas for activities involving 100. Hopefully some of them will be useful to you with your students. So in no particular order…

- Read 100 Hungry Ants to your kids and have them divide 100 by other numbers. Ask how many groups? How many in each group? How many left over? (A 100 dot array is a useful tool here — kids can circle groups they are making right on a small 100 dot array and to figure out the answer for each group size.)

- Give young students (grade 1 or 2) a 100 chart (either 0 to 99 or 1 to 100) and say random numbers for them to find and cover with a bingo chip.

- Have students figure out how far to 100 (or to 100%). Again, a 100 dot array is a useful tool. Given a certain number or percentage, e.g., 23 or 23%, have students figure out how much is needed to get to 100 or 100%.

- Pour out 100 candies such as jelly beans, Skittles, or Smarties and graph them by colours.

- Have students close their eyes and stand when they think 100 seconds have passed.

- Cut pieces of string, estimating 100 cm. See who can come closest to the actual amount (graph the estimated lengths).

- Have students bring in 100 of the same item from home (e.g., pieces of macaroni, Lego blocks, pieces of gum, mini marshmallows, bobby pins, etc) and weigh the different amounts.

- Have students jump rope 100 times and then take their pulses. Graph and compare.

- Hold a 100 second race.

- Create pictures using only 100 cm of yarn or string.

- Use large 10 x 10 grids and have students colour them in two colours to make a pattern or picture.

There are lots of things that can be done to celebrate the day. I am doing several of these activities with my eight classes of students at Charlie Lake School this week. No matter your grade, it is always great to put some fun in math!

Mathematically yours,

Carollee