We are engaging in terrific strategies to figure out such problems...in our head! That's right, mental computation is what it's all about.
Get out the lead, and figure it out in your head!
So finish creating your 1000's book and let's play more "Oh No! 99!" so we can be experts.
Also, SAB 1-4 (3 is EC)
DynaMath pages 6 and 7
2 comments:
What is the difference btw 39 and 22?
I figured this equation out by 30-20=10, 9-2=7, then 10+7 is 17. So the answer is 17 !!
How i figured the equation out is by 20-30=10,9/7=2and then 10+7=17. So that is how i figured the equation out. So the answer is 17!!
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