Find where to buy the TI-84 Plus CE graphing calculator in a variety of bold, fun colors.
For a limited time, download free versions of the most popular TI software and handheld emulators.
Bring a new dimension of learning to your classroom with activities that put math in motion.
Explore teaching strategies to help students succeed on the SAT® and ACT® math tests using TI technology.
Drive deeper, more relevant understanding of science in middle grades and high school.
In this activity, students will develop formulas for the sum of arithmetic and geometric sequences. Students will then find the sum of sequences using the formulas developed.
In this activity, students will first perform a numerical process/proof to find the sum of an arithmetic sequence. To do this, they will be entering the sequence in reverse order and finding the sums of the rows.
After students develop a formula for the sum of an arithmetic sequence, they will apply the formula.
In the second part of the activity, students develop the formula for the sum of a geometric sequence. To do this, they will multiply each term in the sequence by the common ratio, find the difference between the two different values, and divide by a value to determine the sum of column A.
© Copyright 1995-2020 Texas Instruments Incorporated. All rights reserved.