I get kids thinking about the properties of water by having small groups try to melt a cube of ice the fastest. Then we move on to putting 100 ice cubes in a plastic tub and sitting on a table at room temperature. Children make predictions on when they think all the ice will melt. Valerie Hartselle, Alabama, Kindergarten

 

I teach grades seven and eight science in a K-8 school and I like my junior high students to take part in the 100th Day of School celebration. I ask them each to bring in 100 items and we then identify the physical and chemical properties of the items and find the mass, volume, and density. We then find the average mass. This year we are also going to collect 100 "get-well" cards to send to critically ill children in our two local hospitals. This will incorporate the celebration of the 100th day and a service learning project. We will also make an example of a mixture (as compared to a solution) by combining 100 different types of snack foods such as raisins, M&M's, pretzels, goldfish crackers, etc. Junior high students love anything they can eat! Diane Lautermilch, Glen Rock, NJ, Grades 7-8

Weighing: Divide your class into groups, and give each group a set of balance scales and a weight of 100 grams. Then ask them to find items in the classroom that balance the scales. Try using M&Ms to see how many weigh 100 grams. You can even experiment to see if different colored M&Ms have different weights.