10分の1に四捨五入
出力に小数点以下 1 桁と明確なタイメソッド制御が必要な場合は、このページを使用します。
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
Keep one decimal place and inspect the hundredths digit.
2
Step 2
Apply the selected rounding method.
3
Step 3
Return a 1 dp result.
📊 Examples
実用例
Examples include carry-over cases like 19.99 to one decimal place.
| 入力 | ターゲット | 方法 | 結果 |
|---|---|---|---|
| 5.24 | 最も近い 10 番目 (1 dp) | 半分を切り上げる | 5.2 |
| 5.25 | 最も近い 10 番目 (1 dp) | 半分を切り上げる | 5.3 |
| 19.99 | 最も近い 10 番目 (1 dp) | 半分を切り上げる | 20.0 |
ヒント
よくある間違い
Avoid these frequent rounding errors when validating outputs.
- Checking thousandths instead of hundredths.
- Dropping to whole number output by mistake.
- Forgetting to preserve a trailing decimal zero when needed.
- Ignoring method choice at tie boundaries.
❓ よくある質問
よくある質問
Is nearest tenth the same as 1 decimal place?
Yes. Nearest tenth means keeping one digit after the decimal point.
Which digit decides tenth rounding?
The hundredths digit controls whether the tenths digit changes.
Can I switch to 2 dp here?
Use nearest hundredth or the decimal hub for multi-decimal options.
Do methods matter at 1 dp?
Yes. Different methods can produce different results on tie values.