Categories Expressions and Equations Feedback Ratios and Proportions Uncategorized Cross addition isn’t a thing Post author By mpershan Post date August 28, 2013 2 Comments on Cross addition isn’t a thing Presented without comment, and with thanks to Andrew. Share this:EmailPrint ← 1 divided by 2/3 is… → Constants and Exponents 2 replies on “Cross addition isn’t a thing” Apparently it is – and it’s much easier than the insanity-producing cross-multiplication. Of course, it’s not a procedure that would give one any answers that meet with any other reality, but it’s still easier. 🙂 I would want to teach this kid to multiply both sides by 30 as the first step in a problem like this — same as solving any other type of equation in which the variable only occurs once, use inverse operations to isolate your variable. Comments are closed.