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Subtraction + Regrouping CTF

8-10 yrs old

Math & Economics

Students will build math models of base 10 subtraction and use them as obstacles in a Capture the Flag game map.

avatar Submitted By: Minecraft Education

March 6, 2019

Skills

  • Creativity
  • Critical Thinking

External References

Minecraft World File - Single Player

Download the world and open with Minecraft: Education Edition.

Minecraft World File - Capture the Flag

Download the world and open with Minecraft: Education Edition.

Engage NY Link

Associated Engage NY module and lesson.

Supporting Files

Capture the Flag Instructions


Instruction for playing Capture the Flag in Minecraft.

Learning Objectives

  • CCSS.MATH.CONTENT 4.NBT.B.4 Fluently add and subtract multi-digit whole numbers using the standard algorithm.

Guiding Ideas

Materials:

Headphones with mics, Math notebooks and pencils (colored pencils and graph paper are good for this too)

Whiteboard and markers

Begin the class with a discussion leading around these questions and try to connect what the already know about regrouping with the idea that regrouping can go backwards.

1) What is regrouping?

2) How does regrouping work with addition?

a) Do an addition problem or two with them using the standard algorithm

3) In addition we regroup forward, is it possible to regroup backwards?

4) Can I trade one $10 bill in for ten $1 bills?

Next Unveil the big idea:

Regroup can go backwards in subtraction

Show and explain a 3 digit subtraction problem that uses the standard regrouping algorithm and have them enter the Minecraft Single Player World.

Student Activities

The Single Player World

Working is small groups students will go into the world, watch instructional videos and build three subtraction problems in Minecraft. Students are encouraged to co-teach and share their knowledge with one another. The teacher should facilitate and walk the room.

Problem 1: Subtraction Regrouping not needed

Problem 2: Subtraction with Regrouping

Problem 3 Subtraction Regrouping Across Zero

Students will document their work in portfolios and structure block files.

Bonus Make a Video

When a team finishes all 3 problems they will work together on the 4th problem. Their goal will be making a “how to” video of them explaining how they solved the problem. This is a bonus activity but each person should try to make the video. If a student finishes a video they should help a teammate make one.

Debrief Questions

1) How is regrouping the same and different between addition and subtraction?

2) Can I trade in one $10 bills for ten $1 bill?

 

Subtraction Capture the Flag

The students will enter the game in Survival mode and with no items and will be trapped on the map. Once all your students have signed on to the game, have everyone get off their computers and sit together by teams, Purple or Gold. Now that your students are away from their computers push the create map button, this will teleport all players to the room where we will choose our teams.

One at a time, a student from each team will go to their computers and walk through the trip wire and teleport into the map with blocks, a pickaxe, the ability to fly, a camera, and portfolio. Because the way the game is coded, it is very important that the students go in one at a time.

Give the students a multi digit subtraction problem and have them solve it on paper. Once they have the correct answer and check their work with a peer they can enter the world and build the equivalent math model with blocks.

When a student finishes their problem they must

1) peer review an other teammates math model to see if they got the same answer, if not explain what happened

2) Have their worked check by three teammates

3) Co-teach and teammate

Peer Review

Tell students we need to check our work and to fly around and peer review your classmates’ math models. After examining the model label it with the name of the reviewer and the equivalent fractions the reviewer saw. Meaning, if the reviewer saw something different than the creator, there will be different fractions on the sign.

 

Play Game

Once students have all built and check their the math models make sure each team is wearing the team skin.

Have all students sit away from their computers and push the start game button. Students will enter the world one from each team and at a time a chose their character. When a team is on the map the next player on the team will enter the world.

Destroy the other team flag and to win the game.

Performance Expectations

The student did all of the following:

1) The student was able to build,regroup, and solve three base 10 subtraction math model.

2) The student was able to make a video of themselves solving and subtraction problem with regrouping.

3) The student was able to write the standard algorithm for subtraction along with their models.

4) The student was able to build a math model on a field and play capture the flag.

 

Skills

  • Creativity
  • Critical Thinking

External References

Minecraft World File - Single Player

Download the world and open with Minecraft: Education Edition.

Minecraft World File - Capture the Flag

Download the world and open with Minecraft: Education Edition.

Engage NY Link

Associated Engage NY module and lesson.

Supporting Files

Capture the Flag Instructions


Instruction for playing Capture the Flag in Minecraft.