丸め
# 特定の小数点以下の桁数に丸める
1/3 to 2 dp | 0.33
π to 5 digits | 3.14159
# 切り上げと切り捨て
5.5 rounded | 6
5.5 rounded down | 5
5.5 rounded up | 6
# 最も近い x に丸める
37 to nearest 10 | 40
$490 rounded to nearest hundred | $500
2,100 to nearest thousand | 2,000
# 最も近い x に切り上げと切り捨て
21 rounded up to nearest 5 | 25
17 rounded down to nearest 3 | 15Function
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