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 4-digit numbers, multiplying & dividing, fractions, perimeter & area, graphs & line plots. Features a complete answer key. Correlated to current state standards. 160 pages.