Calculating a half-life, the approximate time it takes for the body to remove one-half the active ingredient in a medicine, provides the real-life tie-in to this activity.
when will I ever use this?
Diana L. Moss and Lisa Poling
Students explore the mathematics found in chocolate production.
readers speak out
This opinion piece discusses how simplicity, ease, and efficiency—in the guise of shortcuts, tips, and packed procedures—kill mathematical reasoning.
Alfinio Flores and Melina D. Priewe
Students explore multiplicative comparisons and the meaning of remainders using their own concrete representations, including orange wedges.
Kami M. Dupree
Abandon mnemonics and make stronger connections between the operations and properties of arithmetic.
Casey Hord and Samantha Marita
Support math conversations and teach students to approach various problem-solving tasks by encouraging the use of tables.
Juli K. Dixon and Jennifer M. Tobias
Anticipate and address errors that arise when fractions are placed in context and illustrated with models.
Students analyze how many trees are used to produce toilet tissue.
A cartoon exploring a problem about negatives and positives is coupled with a full-page activity sheet.
A cartoon exploring a problem about salaries, wages, and percentages is coupled with a full-page activity sheet.