Math & Numbers

Significant Figures Sandbox

Practice significant-figure rules with step-by-step feedback: count sig figs, round to N sig figs, convert to scientific notation, and propagate through +/−/×/÷.

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Quick start

Call this tool from your code in three languages.

cURL

curl -X POST 'https://api.elysiatools.com/en/api/tools/significant-figures-sandbox' \
  -H 'Content-Type: application/json' \
  -d '{"number":"0.005030","mode":"practice","guess":4,"roundN":0,"sciDigits":0,"opA":"e.g. 12.5","opB":"e.g. 3.20","operation":"+"}'

API reference

Send a POST request with your inputs as JSON. File parameters require a separate upload first.

Endpoint

HTTP

POST https://api.elysiatools.com/en/api/tools/significant-figures-sandbox

Parameters

Name	Type	Required	Description
number	text	Yes	The number to analyse. Accepts integers, decimals, leading zeros, and scientific notation (1.23e4, 1.23E4, 1.23×10^4).
mode	select	No	Practice gives feedback on your sig-fig guess. Round rounds to N sig figs. Propagate applies the +/−/×/÷ rule to two operands.
guess	number	No	Practice mode only: enter your guess to get correct/incorrect feedback.
roundN	number	No	Round mode only: how many sig figs to round to. Defaults to the number's own count.
sciDigits

MCP integration

Add this tool to your Model Context Protocol server so AI agents can list and call it.

Server configuration

Add this block to your MCP client configuration:

mcp.json

{
  "mcpServers": {
    "elysiatools-significant-figures-sandbox": {
      "name": "significant-figures-sandbox",
      "description": "Practice significant-figure rules with step-by-step feedback: count sig figs, round to N sig figs, convert to scientific notation, and propagate through +/−/×/÷.",
      "baseUrl": "https://api.elysiatools.com/mcp/sse?toolId=significant-figures-sandbox",
      "command": "",
      "args": [],
      "env": {},
      "isActive": true,
      "type": "sse"
    }
  }
}

List available tools

After connecting to the SSE endpoint, list the exposed tools:

tools/list

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/list"
}

Call this tool

Invoke the tool by its id, passing arguments built from its parameters:

tools/call

{
  "jsonrpc": "2.0",
  "id": 2,
  "method": "tools/call",
  "params": {
    "name": "significant-figures-sandbox",
    "arguments": {
  "number": "0.005030",
  "mode": "practice",
  "guess": 4,
  "roundN": 0,
  "sciDigits": 0,
  "opA": "e.g. 12.5",
  "opB": "e.g. 3.20",
  "operation": "+"
}
  }
}

Chain multiple tools in one session with a comma-separated toolId list, e.g. /mcp/sse?toolId=png-to-webp,jpg-to-webp,gif-to-webp (max 20).

Questions or issues? Contact [email protected]

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