Rulers seem like such simple tools, but their importance can't be overstated. Without rulers so many inventions and other human-made achievements would fall apart. Readers will review the basics and observe rulers being used in the working world. They'll even test out their own ruler skills as they find out that rulers rule in science.
ThriftBooks sells millions of used books at the lowest everyday prices. We personally assess every book's quality and offer rare, out-of-print treasures. We deliver the joy of reading in recyclable packaging with free standard shipping on US orders over $15. ThriftBooks.com. Read more. Spend less.