数値の切り捨て
切り捨てでは精度がゼロに近づき、切り上げやタイのルールは適用されません。
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
Choose the place value or decimal precision to keep.
2
Step 2
Remove all digits beyond that position.
3
Step 3
Return the toward-zero result.
📊 Examples
実用例
Examples show deterministic cut-off behavior for positive and negative inputs.
| 入力 | ターゲット | 方法 | 結果 |
|---|---|---|---|
| 2.99 | 最も近い整数 | トランケート (ゼロに向けて) | 2 |
| -2.99 | 最も近い整数 | トランケート (ゼロに向けて) | -2 |
| 45.6789 | 最も近い百番目 (2 dp) | トランケート (ゼロに向けて) | 45.67 |
ヒント
よくある間違い
Avoid these frequent rounding errors when validating outputs.
- Calling truncate a nearest-value rounding method.
- Confusing truncate with floor for negatives.
- Using truncation where tie-aware rounding is required.
- Dropping expected output precision in display formatting.
❓ よくある質問
よくある質問
Is truncation the same as rounding?
No. Truncation removes digits without choosing the nearest value.
How is truncate different from floor?
Truncate goes toward zero, while floor goes toward negative infinity.
When should truncation be used?
Use truncation when exact cut-off behavior is required by your process.
Can truncation be applied to large place values?
Yes. It works for tens, hundreds, thousands, and other supported places.