Cross Multiply
Cross Multiply
If two fractions are equal, say
then it is always true that the products of the numbers given by
are also equal, or ad←= bc. This is the most common form of cross multiplication. That
implies ad = bc can be shown by multiplying both sides of
by the common denominator bd and canceling.
Cross multiplying is a common first step in solving proportions:
is equivalent to
3 × 21 = x × 7 or 7x = 63
Therefore, x = 9.
Adding fractions can also be done with cross multiplication.
The cross product of two vectors does not involve cross multiplying; the resemblance between the two terms is accidental.
More From encyclopedia.com
Cross , Cross
This article treats both the cross and the sign of the cross. It discusses: the history, forms, uses and blessing of the cross, the history and… A.t. Cross Company , A.T. Cross Company
A.T. Cross Company
One Albion Road
Lincoln, Rhode Island 02865-3700
U.S.A.
Telephone: (401) 333-1200
Fax: (401) 334-2861
Web site:… Reciprocal Cross , Skip to main content
reciprocal cross Celtic Cross , Celtic cross. Monumental carved stone cross consisting of a vertical shaft and horizontal arms with a circlet, its centre at the intersection, linkin… Exaltation of the Cross , Exaltation of the Cross a feast observed in the Roman Catholic and Orthodox Churches on 14 September in honour of the Cross of Christ, to commemorate… Crossing , Skip to main content
crossing
cross·ing / ˈkrôsing/ • n. 1. a place where two roads, two railroad lines, or a road and a railroad line cross. ∎ the a…
You Might Also Like
NEARBY TERMS
Cross Multiply