Here are the digital images for the awesome Dragon Bump math games we have been playing at school. We talked about how adding and subtracting 9's and 8's are EASY PEASY because we know how to add and subtract 10's already! I will attach these as images for you to download and print, however, if you'd like the PDF's email me and I can send them to you.
We can use two strategies when adding and subtracting with 9's and 8's. Those two strategies are called:
1. Compensation/Adjusting - this is when we pretend the 9 or 8 is a 10 and then adjust. "Compensation is a mental math strategy for addition and subtraction that involves adjusting one of the addends to make the equation easier to solve."
For example, when solving 9+5, "I know that 10+5=15... but I am using 9 which is one less than 10, so my answer must be one less than 15, I know that 9+5=14"
2. Decomposition - this is when we "decompose" a number by breaking it into parts to create an anchor number. Here is a video link we watched in class to highlight this skill.
https://www.youtube.com/watch?v=sPJRL6zUf2M
* and YES, we really do use these words in our classroom - we like names for math strategies, it helps build metacognition (thinking about thinking)!
Please note, I do not own these games - they are from a math specialist workshop I went to a few years ago. Intellectual property of Sandi Berg!
Also, Mrs. Kawchuk has a message for you on her blog. Please go take a look. Go all the way to the bottom of the blog list!
Enjoy your Spring Break everyone!!
Ms Brown
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