When adding multiple fractions, simplify each term first, eliminate easier fractions first (that can be done mentally), convert rest to LCM to add and subtract — then simplify answer (convert to mixed if necessary).
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).