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Classroom activity Kindergarten Math

Creek Cleanup Countdown: A Kindergarten Litter-Counting Relay

A kindergarten relay activity where small groups count out an exact number of litter pieces from a pretend creek, tracking how many pieces remain within 10.

Objectives

  1. Students will count out an exact given number of objects, up to 4 at a time and 10 in all.
  2. Students will solve subtraction word problems within 10 about litter remaining in a creek.
  3. Students will explain why removing litter from a real creek matters for the animals living there.

Vocabulary

Key words: litter, creek, count out, remain

Teacher overview

This is a small-group relay activity for a whole class, using a blue tarp or a large sheet of blue paper as a pretend creek scattered with 10 pieces of paper "litter." Each turn, a small group is given a specific number to count out, not just "some" litter, so the activity practices counting out an exact given amount rather than counting everything at once. The activity maps directly onto the concept: just as a real litter cleanup crew removes a certain number of items at a time and tracks what is left, each group here counts out a called number, places it in the Clean Creek Bin, and the class recounts what remains scattered on the creek.

Activity Directions

  1. Before class, scatter 10 identical crumpled-paper litter balls across the blue tarp or blue paper "creek" on the floor. Set the empty Clean Creek Bin nearby.
  2. Gather the class around the creek. Explain: "Real creeks and ponds sometimes get litter in them that can hurt the fish and other animals living there. Today we are creek cleaners, and each turn, a group will count out exactly the number of pieces I call before bringing them to the Clean Creek Bin."
  3. Split the class into four small groups. Call up Group 1 and say, "Find and count out exactly 2 pieces of litter from the creek." One or two students from the group go to the creek, count out loud while picking up exactly 2 pieces, no more and no fewer, and place them in the bin.
  4. Call up Group 2 and say, "Find and count out exactly 3 pieces of litter." Group 2 repeats the same counting-out process.
  5. Call up Group 3 and say, "Find and count out exactly 1 piece of litter," then call up Group 4 and say, "Find and count out exactly 4 pieces of litter," each group repeating the same process.
  6. After each group's turn, gather the whole class to count together how many total pieces are now in the Clean Creek Bin and how many pieces are still scattered on the creek tarp.
  7. The relay ends when the creek tarp has no litter left and the Clean Creek Bin holds all 10 pieces. Gather the class and read the numbered debrief questions below aloud, counting the pieces together to check each answer.

Debrief questions to ask the class:

  1. How many pieces of litter did the creek start with before any group cleaned it up?
  2. After Group 1 counted out 2 pieces and Group 2 counted out 3 pieces, how many pieces of litter were still left in the creek?
  3. After all four groups had taken their turns, how many pieces of litter were left in the creek?
  4. Why does taking litter out of a real creek help the fish and other animals that live there?

From Water for Schools (waterforschools.org). This material is in the public domain (CC0) and may be copied, edited, and shared freely.

Answer Key
  1. Answer: 10 pieces. The creek started with 10 pieces of litter scattered on the tarp.
  2. Answer: 5 pieces remain. Group 1's 2 pieces plus Group 2's 3 pieces is 2 + 3 = 5 pieces in the bin, leaving 10 − 5 = 5 pieces still in the creek.
  3. Answer: 0 pieces remain. Once Group 3's 1 piece and Group 4's 4 pieces join the bin, all 10 pieces have been picked up, leaving 10 − 10 = 0 pieces in the creek.
  4. Answer: Litter left in a real creek can be eaten by or get tangled around fish, turtles, and other animals that live there, so removing it keeps the water and the animals safer.

Differentiation

Support

Let a partner or aide count alongside a student who needs support, touching each piece of litter once as it is picked up so the count stays accurate. Use a printed strip with the called number of boxes so students can check off one box per piece.

Extension

Ask confident students to figure out, before the next group goes, how many pieces will be left in the creek after that group's turn, based on the number they will be asked to count out.

ELL supports

Pre-teach litter, creek, and count out using a simple demonstration, picking up two objects while saying "count out two" clearly. Allow students to show their count by holding up the collected pieces instead of speaking a full sentence.

Extensions

If the school grounds have a real puddle, ditch, or drain nearby, take the class to look for any litter and count what the class finds and picks up, connecting the pretend creek relay to a real cleanup. Students should wear gloves, stay back from any water, and leave anything sharp for an adult to pick up. Chart the class's total pieces collected across several days if the activity is repeated, and compare which day's total was greater.