ACT Math For Dummies
Book image
Explore Book Buy On Amazon

You may encounter ACT Math questions that ask you to multiply an entire matrix by a real number. Fortunately, this is a straightforward operation: Simply multiply the integer by every element in the matrix. Doing so is similar to using the distributive property to multiply a number by each term inside a set of parentheses. Yeah, it’s that easy.

Example

Which of the following is the result when you multiply the matrix

image0.png

by 3?

image1.png

To find the answer, you simply multiply each element of the matrix by 3. Place these three answers into a new matrix of the same dimensions:

image2.png

Therefore, the correct answer is Choice (D).

About This Article

This article is from the book:

About the book author:

Mark Zegarelli is the author of Basic Math & Pre-Algebra For Dummies, SAT Math For Dummies (both from Wiley), and five other books on basic math, calculus, and logic. He holds degrees in both English and math from Rutgers University and is a math tutor and teacher.

This article can be found in the category: