It is a Grade 3 Math class and the lesson would be base on 3 digits whole numbers subtractions.
How should I introduce the lesson and what sort of warm up games I could use?
Divide the class up into two (or three) even teams. Write a problem on the board in the front of the class and call 1 kid from each of the teams up to the board. When you say go, the first team to have the correct answer written gets a point.
The team with the highest score gets a special treat. (A piece of candy or something.)
Or do an around the world type of game. One kid against another. You show them a flashcard with a question on it, the first one to correctly tell you the answer gets to advance to the next kid. Whichever kid wins the next "round" goes on to the kids seat behind him to verse him. Make sure everyone gets at least one turn.
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If u and 2 of your friends rob a bank for $1million dollars, on the way out one of you got shot and die, how many survived to get the money.
OMG lol i didnt see it was for the 3rd grade lol…..
Okay heres another 1
If you're a pimp and have 5 hoes working for you… the next day 1 ho goes missing, so u decided to hire 5 more, how many hoes do u have in total?
This is so much better
References :
When I was younger, games were never too much incentive to learn. If you could reward them, I think you might have more success in them learning the material. For instance, candy for whoever answers the "bell ringer" questions.
References :
Divide the class up into two (or three) even teams. Write a problem on the board in the front of the class and call 1 kid from each of the teams up to the board. When you say go, the first team to have the correct answer written gets a point.
The team with the highest score gets a special treat. (A piece of candy or something.)
Or do an around the world type of game. One kid against another. You show them a flashcard with a question on it, the first one to correctly tell you the answer gets to advance to the next kid. Whichever kid wins the next "round" goes on to the kids seat behind him to verse him. Make sure everyone gets at least one turn.
References :
I loved this game when i was a kid…
Around the world.
a kid will go head to head with the kid sitting behind him…
you give them a problem…say 213 – 100
the first kid to answer correctly moves on to the next kid and continues to move on until he/she is defeated…then the person who defeats the champion is the new champion and continues to move on until they are defeated…
whoever stays on top the longest [answers the most questions correctly gets a candy]
or you could use some thing dealing with money…
References :
I disagree with all the answers I've seen so far. I may be an idealist, but I believe it's harmful to convince children that they need to be rewarded in order to do math. I also feel that competitive games will encourage students who do well at them, but discourage weaker students. (It may be possible to use competition in a constructive way, but this needs careful handling.)
One thing you could do before the lesson is have the students start with one three-digit number, and try to figure out how much to add in order to reach another (larger) three-digit number. Of course this *is* subtraction, but packaged differently. After they try this for a while, with an assortment of numbers, you can offer them a shortcut–namely, your lesson on subtraction.
There's an old French math game: I thought it was called "Le Conte Es Bonne," but my web search turned up nothing useful. My spelling may be off, or the game may no longer exist. The players are shown 6 cards with numbers (selected from 1-10, 25, 50, 100) on them. The object is to combine some or all of those numbers, using the basic four operations, in order to reach a given 3-digit target number. As published, the game is competitive: the goal is to use the fewest possible number of cards, or the least amount of time, or…well, I haven't played it in a long time. But you could just as well tweak the goal of the game in order to celebrate diverse solutions. I found this game to be a great review of operations.
Also, students respond very well to "magic tricks" or other surprising computations. I found one at Mudd Math that is much better *after* they know 3-digit subtraction than before; it's linked at bottom.
References :
http://www.engines4ed.org/hyperbook/nodes/NODE-148-pg.html
Before:
http://www.kidzone.ws/math/farm/t_math.asp?add_blank.asp?au=999&al=100&bu=999&bl=100&d=v
After:
http://www.kidzone.ws/math/summer/t_math.asp?gr2b-magicsub.html
http://www.math.hmc.edu/funfacts/ffiles/10002.1-8.shtml