# Decimal Operations

Canonical: https://manyspace.aporia.systems/topics/decimal-operations-mth-arith-006
Updated: 2026-10-13

Mathematics · Arithmetic · MTH-ARITH-006

- Difficulty: 1 / 5
- Importance: 5 / 5
- Study time: 1–1.5 h

place value, rounding, significant digits intro

## Why it matters

Number sense is the absolute foundation; every later topic in all three domains builds on fluent arithmetic.

## Where it is used

Daily business math (pricing, margins, interest), engineering tolerances, and every symbolic calculation in physics.

## How you know you have learned it

Explain from memory in your own words + answer 2 transfer questions correctly.

## What you need first

Nothing: this is a starting point.

## Resources

- Khan Academy: Arithmetic — Khan Academy