It usually tells the exact number of digits. If it is accurate to ten digits, 491 is about 490. Press rounding Algorithm, if Ones If the number on the top is below 4, for example, 362, it is about 360; if the number on the single digit is greater than five, for example, 287, it is about 290 Approx. symbol input method:
use Sogou input method or QQ Pinyin Input Method , on Input box Enter "about equal to", select 5: ≈ 
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