Contenido. 1. Understanding numbers. p.1.-- 2. Addition and subtraction. p.25.-- 3. Addition with trading. p.55.-- 4. Subtraction with trading. p.83.-- 5. Measurement. p.111.-- 6. Multiplication facts to. p.141.-- 7. Multiplication facts to. p.163.-- 8. Geometry. p.187.-- 9. Division facts to. p.213.-- 10. Division facts to. p.237.-- 11. Using numbers. p.259.-- 12. Fractions. p.277.-- 13. Working with greater numbers. p.301.-- 14. More multiplication and division. p.317.-- Finding and using information. p.341.
