idea for a frame | Manualidades, Artesanía de familia, Marcos de cartón
How Much Is 70 Percent Off? (Calculating Percentages in Your Head)
Wondering how to calculate 70 percent off? How do you learn to calculate percentages in your head? Practice, practice, practice. Seriously, doing mental math in your head isn't that hard when you understand a few shortcuts. Here are our tips.