Simple and compound interest

Interest, future value, rate and term; successive increases and discounts; compounding

The Simple and compound interest unit belongs to the Fractions, decimals and finance section of Math Mental and has 15 lessons: interest, future value, rate and term; successive increases and discounts; compounding.

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Sample questions

In the lesson, numbers change every session and the solution appears after you answer.

$C = 2\,000,\; i = 3\%,\; t = 5$
Step by step
1. $\displaystyle J = C \cdot i \cdot t = 2\,000 \cdot 0.03 \cdot 5$
Answer $J = 300$
$(1 + 20\%)(1 - 20\%) - 1$
Step by step
1. $\displaystyle 1.2 \cdot 0.8 = 0.96$
Answer $-4\%$
$M = 1\,000 \cdot 1.1^{2}$
Step by step
1. $\displaystyle 1.1^2 = 1.21$
Answer $1\,210$

Lessons in this unit

Simple interest Lesson, 8 questions
Simple future value Lesson, 8 questions
Rate and term in the same unit Lesson, 8 questions
Practice: simple interest Practice, 10 questions
Unknown rate Lesson, 8 questions
Unknown term Lesson, 8 questions
Unknown principal Lesson, 8 questions
Successive increases and discounts Lesson, 8 questions
Cumulative change Lesson, 8 questions
Equivalent single discount Lesson, 8 questions
Compound future value Lesson, 8 questions
Simple × compound Lesson, 8 questions
Compounding factor Lesson, 8 questions
Review: interest and percentages Practice, 12 questions
Unit test 12 questions

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Sample questions

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Lessons in this unit

Your first lesson takes five minutes