Those individuals (see image) of whom have completed a bachelor's degree in mathematics or have taken some math courses for their degree in college may now be interested in taking more online courses in math at the graduate level. If this is true, the next section of this article will list a few schools who offer an online graduate math certificate.
As Dean Schlicter once said, "go down deep enough into anything and you will find mathematics."  Math is essential for science, engineering, and research. Much of what we do is based on mathematical situations. The fact remains math is an important subject (and worth studying) to carry out tasks involving computations.
Advice: Check out the Math Forum at Drexel University (https://mathforum.org/dr.math/faq/faq.why.math.html) for more reasons of "Why Study Math?"
Online Schools and Courses
Here are three schools that offer Online Graduate Certificates in Math…
- University of Central Florida (UCF) offers a Graduate Certificate in Applied Mathematics. The program consists of 18 credit hours of online graduate courses in mathematics. Courses include: Calculus (I,II,III), Matrix and Linear Algebra,and Differential Equations. To know more about the course requirements and tuition, propospective students can go to the School's Web site or view the program at www.math.ucf.edu/grad/certificate.pdf. The school is accredited by the Commission on Colleges of the Southern Association of Colleges and Schools (SACS).
- Drexel University offers a Certificate of Graduate Study in Mathematics Learning and Teaching. The program consists of 5 3-credit courses (15 credit hours) of online graduate courses in mathematics. The courses are intended to provide the skills and expertise needed for students to implement problem-based, student-centered, technology-intensive instruction. The school is accredited by the Middle States Association of Colleges and Secondary Schools (MSA). The school offers a special tuition rate for online students: $720 per credit.
- Kaplan University offers a Graduate Certificate in Mathematics Teaching. The program is geared towards those individuals interested in teaching mathematics at the elementary or secondary levels. Total program requirements: 17 credit hours. Cost: $385.00 per credit hour, which totals $6,545.00. Additional fees: The program requires a $100 technology fee per term. The school is accredited by The Higher Learning Commission (HLC) and is a member of the North Central Association of Colleges and Schools (NCA).
For a list of schools that offer Online Mathematics Degrees: https://www.degrees-online.com/Technology/Mathematics/.
Here is a few schools that offer Online Calculus Courses.
Earning an online graduate math certificate may lead to a career as a mathematician or some other work in applied mathematics. As pointed out by U.S. Bureau of Labor Statistics, "mathematics is used extensively in physics, actuarial science, statistics, engineering, and operations research."  Job prospects are good and so is the pay when employed in industry and the government. As a math teacher, more pay is determined by the level of math and type of students (high school, college, university) of whom are being taught.
Image credit: Student (9579kfr7c2sras)
List of Schools
University of Central Florida (UCF), Department of Mathematics: https://www.math.ucf.edu/grad/gradinfo.shtml
Drexel University Online: https://www.drexel.com/online-degrees/education-degrees/cert-mlt/index.aspx
Kaplan University: https://online.kaplanuniversity.edu/pages/graduate_certificate_mathematics_teaching.aspx
Sources and References Section
 Quote Garden (Quotations about Math): https://www.quotegarden.com/math.html
 U.S. Bureau of Labor Statistics: https://www.bls.gov/oco/ocos043.htm