What is the Metric system? Learn about meters, grams, liters and why the metric system makes so much sense. King Henry will help you memorize the standard prefixes.
There are 20 books in the Pre-Algebra series. The first books continue from the Fraction series with more work on fractions and decimals. Books progress through percentages, proportions, metrics, scientific notation, order of operations and finally, probability in Book 20. Students who complete the Pre-Algebra series are now fully ready for Algebra (coming soon).