Crossword clues for No. 1 5 letters:RATIO1:1, for oneRATIO4:1 or 1:5, e.g.ERROR1 + 1 = 3, for exampleSINESIn mathematics, they're never more than 1 or less than minus 1.SCALE1 inch = 1 mile, e.g.ISSUEVolume 1, Number 1, for oneFLUKE1 in a 1,000,000 occurenceCLUES1-Across and 1-Down, e.g.RATIO1:1,000,000, for exampleSCENEAct 1, __ 1EVENSRoulette bets with nearly 1:1 oddsBASICLike the math problem 1 + 1KATTYAbout 1 lb. in China: Var.SCENEPart of 1 Across.MARCHWhat 1 Down does and when.SAINTOne honored on November 1.PEACE1,050-mile river in Canada.EMILY#1 baby girl name, 1996-2007FRODO4'1" hero of fantasy fiction filmsALCAN1,671-mile highway recently completed.ARIASFortes of 1 and 7 Across.MILLE1,000: French.TONNEWeight of 1,000 kilograms.LITREMetric measure, approximately 1 quart.MILER1,760-yard runnerELTONJohn with nine #1 hits in the U.S.RATIO100 to 1, for oneMETERDevice in 1 AcrossCOREDWith the 1 Across removedUPDOSSome 1 DownLAVALNo. 1 collaborationist.TRIPPSee 1-AcrossNEGRO1,400 mi. river, tributary of Amazon.GRAND$1,000.LIANG1 1/3 ounce in China.CUPIDRunning mate of 1 Across.LORDEOne-named singer with the #1 hit "Royals"ALCAN1,671-mile highway.PEACE1,050-mi. river in W. Canada.LIANGChinese unit of weight, 1 1/3 oz.LORDERoyally named singer with the #1 album "Melodrama"DIGIT1, 5, or 9MCGEEBobby in a 1971 #1 hitONEAL7'1" NBA greatREESEWitherspoon with a 1 AcrossALBEEThree-Pulitzer playwright [#1 of 7]FOOTSU-turn #1, part 2LIBELParticular type of 1 AcrossOCHOAFormer #1 LPGA golfer LorenaLAKESWater "related" to 1 Across