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4th Grade Clustering Number Games

Cluster estimation helps turn complex math problems into simple ones. When teaching your fourth graders about cluster estimation, you can organize a few games for your students to play. Clustering number games will teach them how to solve the complex problems in a fun way. Persuade your students and keep them interested in the games by awarding small prizes, such as pencils or notepads, to game winners.
  1. Worksheets

    • Print long addition problems, such as ̶0;17+16+21+18̶1; or ̶0;32+28+33+27,̶1; on a sheet of paper. Make one copy for each student and have her place the paper face down on her desk. When you say, ̶0;Go,̶1; the students must flip over the paper and try to solve the problems as fast as possible using cluster estimation. They must round the numbers by the closest 10. For example, the above problems would be ̶0;20+20+20+20̶1; or ̶0;30+30+30+30.̶1; The first child to finish the worksheets with all the correct answers wins the game. Alternatively, do the same thing with multiplication instead of addition.

    Guessing

    • Call out four numbers to your students and tell them to guess what the cluster number is. The cluster number is the best common number that ends in zero that the numbers in the problem cluster around. For example, if you call out, ̶0;694+701+715+69,̶1; the correct answer would be 700. The first student to raise his hand and tell you the correct number wins the game. Another idea is to give each student five problems. If a student answers each problem correctly, award him with a prize.

    Teams

    • Divide the students into two teams for a team challenge. Call out a math problem to each team. They have one minute to give you the correct answer. If they answer correctly, award them with one point. The team with the most points wins the game. Make the game more of a challenge by only giving the student 30 seconds to come up with the correct answer, or making the math problems more difficult.

    Hunts

    • Create a math scavenger hunt in your classroom to help your students with cluster estimation. Write down several numbers on small slips of paper and hide them around the room. Call out a problem like ̶0;99+110+95+101̶1; to one student. That student has one minute to find the answer to the problem, which is 400 (100+100+100+100). If she finds it, award her with a small prize. For added fun, allow the students to make up their own math problems and hide the answer. The students will read the problem to another student who must find the answer.


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