working with signed numbers
, percentages, interest rates, and data interpretation.
Real-world contexts which make operations with signed numbers
meaningful are sorely needed.
These investigators compared the presentation of addition and subtraction problems with signed numbers
in Japanese and American textbooks.
To help students develop a mental model for the addition of signed numbers
, Supermath developed a computer simulation called "Three-Smile Island.
Prealgebra is appropriate for students age 10 and over, and includes all the basic math concepts necessary for success in algebra, including fractions, decimals, ratio and proportion, percents, signed numbers
, an introduction to geometry, and an introduction to algebra.