This mathematics textbook, written in Portuguese, is designed for second graders. Developed from objectives set forth by the National Portuguese Materials Development Center, it follows closely the objectives and methodology of major curricula used in schools of the United States. The thirteen chapters deal with: numeration (0-999); addition with and without regrouping; subtraction with and without regrouping; commutative and associative properties; length, time, weight, capacity, and temperature measurements; money; geometric figures, perimeter, and graphs; fractions; multiplication; divisibility; and word problems. (MNS)