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math_precision

Guide to Precision Loss, Division before Multiplication, and Rounding

Skill by itsdarktoday

IndexedMIT★ 12
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Works with Claude Code, Claude apps, Codex, Cursor, Gemini CLI, GitHub Copilot, VS Code, OpenCode, Goose, Windsurf. Read the repository before you give any tool access to your data.

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About

Guide to Precision Loss, Division before Multiplication, and Rounding

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Permissions

What this skill can do and what it asks for, from its SKILL.md. Checked Oct 25, 2026.

Tools
No tools found
Secrets
None asked for
Install scripts
None found

Network hosts it talks to 1

  • codeload.github.com · found in install command

Files it touches

  • ~/.claude/skills/math-precision

What's inside

Skill name
math_precision
Description
Guide to Precision Loss, Division before Multiplication, and Rounding
License
MIT
Instructions
21 lines in SKILL.md · view on GitHub

Agent Skills spec issues

  • name: only lowercase letters, digits and single hyphens allowed

Files (1)

  • SKILL.md

SKILL.md (first lines)

# Math Precision, Rounding & Arithmetic Security

### 1. Division Before Multiplication
- **Anti-Pattern**:
  ```solidity
  uint256 reward = userBalance / totalBalance * rewardPool; // userBalance / totalBalance truncates to 0!
  ```
- **Remediation**:
  ```solidity
  uint256 reward = (userBalance * rewardPool) / totalBalance;
  ```

### 2. Decimal Mismatch & Precision Loss
- Scaling between 6-decimal tokens (USDC, USDT), 8-decimal tokens (WBTC), and 18-decimal tokens (DAI, ETH).
- Always scale up to 18 decimals before division, and scale down only at the final settlement step.

### 3. Unchecked Arithmetic Hazards
- In Solidity 0.8+, `unchecked { ... }` bypasses compiler overflow/underflow checks.
- Audit every `unchecked` block for possible underflow in balance subtractions or counter loops.

From itsdarktoday/auditcode, MIT.

More from itsdarktoday/auditcode

Signals

Stars
12
Forks
6
Open issues
0
Last commit (this folder)
Aug 27, 2026 (2 months ago)
Last release
Sep 15, 2026 (1 month ago)

From GitHub (fetched Oct 24, 2026).

Details

License
MIT
Repository
github.com/itsdarktoday/auditcode
First seen
Oct 24, 2026
Last checked
Oct 24, 2026
Source
GitHubgithub-graphql

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Cite this page

math_precision skill. Agent Mart. https://agentmart.dev/skills/itsdarktoday-math-precision (last updated 2026-10-24)