バンカーズラウンド
バンカーの丸め (半偶数) は、タイ バイアスが重要となる繰り返し計算用に設計されています。
四捨五入計算機
数値を入力し、丸め設定を選択します
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🪄 簡単な例
📋 How It Works
仕組み
1
Step 1
Round normally when the deciding digit is not an exact tie.
2
Step 2
On exact ties at 5, check the kept digit parity.
3
Step 3
Choose the even outcome to finish rounding.
📊 Examples
実用例
Examples focus on tie-value parity decisions.
| 入力 | ターゲット | 方法 | 結果 |
|---|---|---|---|
| 2.5 | 最も近い整数 | ラウンドハーフイーブン(バンカーズ) | 2 |
| 3.5 | 最も近い整数 | ラウンドハーフイーブン(バンカーズ) | 4 |
| 6.25 | 最も近い 10 番目 (1 dp) | ラウンドハーフイーブン(バンカーズ) | 6.2 |
ヒント
よくある間違い
Avoid these frequent rounding errors when validating outputs.
- Assuming every tie rounds upward.
- Ignoring odd/even parity of the kept digit.
- Applying Half Even logic to non-tie digits unnecessarily.
- Using Half Up in workflows that require bias reduction.
❓ よくある質問
よくある質問
Why is this called banker's rounding?
It is widely used in finance and statistics to reduce cumulative rounding bias.
Does Half Even always round ties down?
No. Ties round to the nearest even outcome, which can be up or down.
When should Half Even be preferred?
Prefer it when repeated rounding should not drift systematically upward or downward.
Can Half Even be used for large numbers?
Yes. It works for all supported place values.