**Vocabulary**

compound interest, interest, simple interest

**TEKS** 8(1)(D), 8(1)(G), 8(12)(D)

When you deposit money in a bank account, the bank pays you **interest** for the right to use your money.

**Earning Interest** An account earns interest at regular intervals, such as yearly, monthly, or weekly. The length of time is the **interest period**.

The amount of money deposited in an account is the **principal**. The **balance** of an account is the sum of the principal and the accumulated interest.

**Simple Interest Simple interest** is interest paid only on an account's principal. Simple interest is calculated as a percent of the principal. The percent is the **interest rate**.

Time *t* is the length of time the money is in the account. When the interest rate *r* is an annual interest rate, *t* is in years.

Digits, Grade 8, Volume 2, Homework Helper
Unit D: Two-Dimensional Shapes
Unit E: Measurement and Data
Math Symbols
Formulas Measures
Properties

Topic 11: Scatter Plots
Topic 12: Samples

Unit F: Personal Financial Literacy
Unit G: Step-Up Lessons
- 11-1: Interpreting a Scatter Plot
- 11-1: TEKS Practice
- 11-2: Constructing a Scatter Plot
- 11-2: TEKS Practice
- 11-3: Investigating Patterns – Association
- 11-3: TEKS Practice
- 11-4: Linear Models – Fitting a Straight Line
- 11-4: TEKS Practice
- 11-5: Using the Equation of a Linear Model
- 11-5: TEKS Practice
- 11-6: Additional Problem Solving
- 11-6: TEKS Practice

Topic 15: Step-Up Lessons

English/Spanish Glossary
Formulas
- 15-1: Solving Equations Using the Distributive Property
- 15-1: TEKS Practice
- 15-2: Solutions – One, None, or Infinitely Many
- 15-2: TEKS Practice
- 15-3: Exponents and Multiplication
- 15-3: TEKS Practice
- 15-4: Exponents and Division
- 15-4: TEKS Practice
- 15-5: Operations with Numbers Expressed in Scientific Notation
- 15-5: TEKS Practice
- 15-6: Solving Simultaneous Linear Equations Using Addition
- 15-6: TEKS Practice
- 15-7: Solving Simultaneous Linear Equations Using Subtraction
- 15-7: TEKS Practice