Lately, I've been noticing that when I grade students solve for the missing variable in 2-step equations, my students are trying to isolate the variable by dividing/multiplying both sides by the coefficient (ie. they're using the multiplicative inverse) rather than doing the additive inverse 1st.
Example - If ax + b = c then they would divide both sides by "a" 1st before subtracting "b"
How do you "unteach" this? And you have time please put your 2 cents as to why are students doing this? I've always taught my students to do the inverse of PEMDAS (SADMEP) solving equations. But is there a better strategy?
- Assessment / Common Core / Differentiation / Planning