比如数字在A列,从A1开始,可以在B1输入公式:=if(a1<11,"一档",if(a1<21,"二档","三档"))将公式向下拉填充复制就可以。
F1写公式:=LOOKUP(E1-0.5,{0,10,20,30},{"A","B","C","D"})