Spectrum Math helps reinforce basic and advanced math skills. Age-appropriate lessons are progressive, building on prior material. Chapters feature pre-tests and post-tests, plus mid-tests and a final test, which help track progress. Concepts covered include adding & subtracting 2-digit & 3-digit numbers, writing numbers in expanded form, components of 3-D shapes, fractions, metric & customary measurement. Features a complete answer key. Correlated to current state standards. 160 pages.