I'm a 1st year 5th grade teacher (I did one long term leave last year in 5th grade for 3 months). We are required to use Investigations in Number, Data and Space (1st edition) as our math curriculum. We also have Scott Foresman Addison Wessley that we can use to supplement. I am very unfamiliar with investigations and am finding it very hard to teach. Does anyone use this? Any tips or resources I can use? We are starting with Mathematical Thinking at Grade 5.