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## #3624. 100s Day Math

Mathematics, level: Kindergarten
Posted Wed Jan 25 17:57:44 PST 2006 by Jessica Ash (jmash@socal.rr.com).
H.B. Anderson Elementary, Garden Grove, CA
Materials Required: 100 item collections, ziplock baggies, 10 grid
Activity Time: approx. 45 min-1 hour
Concepts Taught: number sense, rote counting

Read 100th Day Worries by Margery Cuyler. Students were supposed to have counted their 100s day items several times at home. Ask, "How many of you counted your 100s day items at home before you brought it to class?" Discuss the items that students brought. Count the number line to 100 (or higher).
Students will be divided into groups of no more than 7 for this job.
Students will sit at a table with their ziplock baggies of items they had brought for 100 Day. (If students didn't bring items from home, they will use Math manipulatives.) Students will arrange their items into groups of 10 on the 10 grid mat, by color if possible. (ie 10 red gummy bears, 10 blue and so on) Students will then practice counting their items singly and by tens, at least to 30.
Teacher will model dividing a 100s day collection into groups of ten and placing those items on the ten grid mat. The teacher will model sorting items by color. The teacher will ask the class to help count to ten for each group, and then by tens once the items are placed on the mat.
After modelling the grouping strategy, ask students, "How many items did I count before I placed them on the mat?" (10) "So how many will you count before you place them on the mat?" (10)
After the students are seated at the table, we will as a group count the first set of ten things together and place them on the ten grid.
Encourage students to show their moms, dads or grandparents at home how they can group their 100s Day items by ten and count all the way to 100.