Hello, I was wondering if you could help me with a question? Yesterday my daughter came to me and asked if I could help her solve these three problems. 18 percent of 25 is what? 18 percent is what of 25? 25 is what percent of 18? The only way I could think of to figure this out was with the calculator and doing 18 x 25 %= 4.5 is this the answer for all three questions? Thanks for helping me out. Hi Pete First, I would say that using percent in the age of calculators is bit of 'abacus arithmatic'. I know it is still in the curiculum and in lots of vocabulary, but really is just an extra burden on the real issues. [I was struck by this, again, the last time I did my taxes ; ( ] 18% = 18/100 = 0.18 The WHAT is the variable in an algebra question - so you may have to write something, change the appearance then use the calculator. 0.18 x 25 = [What]? Yes [What] = 4.5. 0.18 x [What] = 25?That means [What] = 25 / 0.18 - a different calculation and a different answer. 25 = [What] x 18 / 100?[What] = 25 x 100 / 18. - different again. Hope this makes 'sense' of what they expected. Not to be confused with - these were sensible questions!! Walter Whiteley

Go to Math Central