Open Middle®
Directions: Using the integers -4 to 4, at most one time each, create an inequality with solutions of x > 2/3.
Hint
How does an inequality symbol change from greater than to less than?
How do we ensure that the signs of the numbers do not change?
How do we ensure that the signs of the numbers do not change?
Answer
-3x < -2
Source: Robert Kaplinsky
Sixth grade does have kids write and graph inequalities, but this one is beyond sixth grade level under Common Core: they don’t really do any operations with negative numbers yet, and definitely don’t solve inequalities with negative coefficients or numbers.
Thanks, as always, Julie. I changed it to 7.EE.4. Does that seem to fit better?
http://www.corestandards.org/Math/Content/7/EE/B/4/
It’s a 6th grade TEK in Texas. Thank you!
Perfect for 7th grade! Can’t wait to do this!
-3x<-2
Can I spice this up for high school students and make it a two-step inequality with fractions?