Mathematics (styled Ma+hematics) is the twelfth studio album by singer-songwriter Melissa Manchester, issued in April 1985.

The song "Just One Lifetime" was sung by Barbra Streisand to James Brolin during their wedding in 1998, and she recorded it for her 1999 album A Love Like Ours.

The next two singles, the Hi-NRG track "Energy" (the only one to have a music video) and the ballad "Just One Lifetime", failed to chart.

The album itself had limited success and continued Manchester's chart decline, peaking at a low No.

The album was released on compact disc on November 2, 2018 by Real Gone Music, as a 2-CD set, with the second Disc containing extended mixes of singles, unreleased songs and other material from her MCA years, such as "The Music of Goodbye", a duet with Al Jarreau.