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Alien In-Line skating!!
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Roller Coaster Math 
(we have used roller coasters to examine subtraction on an open number-line and to visualize doubles strategies)
*ask me about this picture and how I can think about subtraction! Remember that some people won a contest and are not getting off the coaster. Their seats are not available!

There is another side to this rollercoaster. Students were asked to draw the same rollercoaster from above, like from a 'birds eye' view. Do they see doubles? How would you calculate how many people can get onto the coaster.

Beginner Doubles song
https://www.youtube.com/watch?v=M9YQ4phTB0E

We are reviewing doubles to 20. Students are working on visual math, where they would look for strategies to help them quickly calculate and understand doubles by looking for the friendly 5's and 1's inside of a number without only memorizing or guessing.

For example: '7+7' can also be seen '5+2' + '5+2' = 10+4= 14

EXTENSIONS:
If you know 7+7, then you also know 70+70, or 700+700 etc...
If you know 7+7, then can you use logic and reasoning to figure out 7+8
(7+8 is the double 7+7 plus 1more)
If you know 20+20=40 and 3+3=6, then 23+23=46
And then do you know that 23+24=47 is just ONE more?!


1+1+2
2+2=4
3+3=6
4+4=8
5+5=10
6+6=12
7+7=14
8+8=16
9+9=18
10+10=20