半分切り捨て
ハーフダウンは、上向きのタイバイアスを軽減する必要がある場合のタイ固有の方法です。
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 to the nearest value for non-tie digits.
2
Step 2
On exact ties at 5, round downward.
3
Step 3
Keep method behavior consistent across all place values.
📊 Examples
実用例
Tie cases are emphasized so Half Down differences stay clear.
| 入力 | ターゲット | 方法 | 結果 |
|---|---|---|---|
| 2.5 | 最も近い整数 | 半分切り捨て | 2 |
| 7.45 | 最も近い 10 番目 (1 dp) | 半分切り捨て | 7.4 |
| 1250 | 最も近い百 | 半分切り捨て | 1200 |
ヒント
よくある間違い
Avoid these frequent rounding errors when validating outputs.
- Treating Half Down as a directional method.
- Forgetting that values above 5 still round up.
- Applying Half Down when regulation requires Half Even.
- Ignoring sign-sensitive cases in test examples.
❓ よくある質問
よくある質問
What is the Half Down tie rule?
Exact ties at 5 round down; values above 5 round up.
Is Half Down the same as floor?
No. Half Down is nearest-value with tie logic, floor is directional toward negative infinity.
When is Half Down useful?
It is useful when your rounding policy requires downward tie handling.
Can I compare Half Down with other methods?
Yes. Use related method pages for direct tie-policy comparisons.