This book will present the basic concept of equivalent ratios. The standard formula for finding a proportion is: ‘is’/’of’ = %/100. Problems will ask you to solve for one of the 3 unknowns, given the other two.
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).