①整數(shù)Integers:
    自然數(shù)Natural Numbers
    零Zero
    負(fù)整數(shù)Negative Integers
    偶數(shù)Even Numbers
    奇數(shù)Odd Numbers
    ②小數(shù)Decimals:
    循環(huán)小數(shù)Recurring Decimals
    非循環(huán)小數(shù)Terminating Decimals
    ③分?jǐn)?shù) Fractions:
    百分?jǐn)?shù)Percent
    千分?jǐn)?shù) Permille
    把……四舍五入到 round off..to