四捨五入計算機
すべての丸めターゲットとメソッドを 1 か所にまとめて必要な場合は、コア計算機を使用します。
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
Enter a number and choose the target place value.
2
Step 2
Pick a rounding method that matches your policy.
3
Step 3
Review the result, number line, and step-by-step explanation.
📊 Examples
実用例
These examples cover decimal, whole, and sign-sensitive rounding.
| 入力 | ターゲット | 方法 | 結果 |
|---|---|---|---|
| 845.67 | 最も近い整数 | 半分を切り上げる | 846 |
| 9876.543 | 最も近い百番目 (2 dp) | ラウンドハーフイーブン（バンカーズ） | 9876.54 |
| -12.349 | 最も近い百番目 (2 dp) | トランケート (ゼロに向けて) | -12.34 |
ヒント
よくある間違い
Avoid these frequent rounding errors when validating outputs.
- Choosing the wrong place value for the reporting context.
- Assuming all methods treat tie values ending in 5 the same way.
- Mixing floor and truncate behavior for negative values.
- Ignoring carry-over when digits round upward.
❓ よくある質問
よくある質問
Which method is selected by default?
Round Half Up is selected by default and you can switch methods anytime.
Can I round decimals and large numbers here?
Yes. The core page supports all place values from ten-thousandth up to million.
Does this support negative numbers?
Yes. All methods work with positive and negative values.
Where can I see method-specific guides?
Open dedicated method pages such as banker's rounding, ceiling, floor, and truncate.