温馨提示：本站仅提供公开网络链接索引服务，不存储、不篡改任何第三方内容，所有内容版权归原作者所有
AI智能索引来源：http://www.edu.com/math-glossary/Doubles-Plus-1-Definition-Examples
点击访问原文链接

Doubles Plus 1: Definition and Example | EDU.COM

进入原网站 导航首页
Doubles Plus 1: Definition and Example | EDU.COMEDU.COMResourcesBlogGuidePodcastPlanBackHomesvg]:size-3.5">Math Glossarysvg]:size-3.5">Doubles Plus 1Doubles Plus 1: Definition and ExampleTable of ContentsDefinition of Doubles Plus One Strategy

Doubles Plus One is a mental math strategy used to solve addition problems involving two consecutive numbers. This approach builds upon the foundation of "doubles facts" (such as 1+11 + 11+1, 2+22 + 22+2, 4+44 + 44+4) to solve problems where one addend is exactly one more than the other. To apply this strategy, students break one of the addends to create a doubles fact, then add the remaining 111. For example, when adding 4+54 + 54+5, students can think of it as (4+4)+1=9(4 + 4) + 1 = 9(4+4)+1=9, utilizing their knowledge of doubles.

Doubles Plus One differs from regular Doubles Addition in its application and structure. While doubles addition involves adding identical numbers (like 3+33 + 33+3 or 7+77 + 77+7), Doubles Plus One specifically deals with consecutive numbers (like 3+43 + 43+4 or 7+87 + 87+8). Both strategies are considered "near doubles strategies," with Doubles Plus One being used when the second addend is one more than the first, and a related strategy called "Doubles Minus One" being used when the second addend is one less than the first.

Examples of Doubles Plus One Math Strategy Example 1: Fill in the Blanks Using Doubles Plus One Problem:

Problem: Complete these equations using the Doubles Plus One strategy:

4+3=3+_+_4 + 3 = 3 + \_ + \_4+3=3+_+_ 6+7=6+_+_6 + 7 = 6 + \_ + \_6+7=6+_+_ Step-by-step solution:

Step 1, identify which number needs to be broken down to create a doubles fact. When adding consecutive numbers, we typically break down the larger number.

Step 2, for the first equation (4+3)(4 + 3)(4+3):

Since 444 is larger, we can break it down into 3+13 + 13+1:

4+3=3+(3+1)=3+3+14 + 3 = 3 + (3+1) = 3 + 3 + 14+3=3+(3+1)=3+3+1

Step 3, for the second equation (6+7)(6 + 7)(6+7):

Since 777 is larger, we can break it down into 6+16 + 16+1:

6+7=6+(6+1)=6+6+16 + 7 = 6 + (6+1) = 6 + 6 + 16+7=6+(6+1)=6+6+1

Step 4, remember that the goal is to create a doubles fact that you already know, then add the remaining 111.

Example 2: Addition Using Near Doubles Problem:

Problem: Add 555 and 666 using the Doubles Plus One strategy.

Step-by-step solution:

Step 1, recognize that 555 and 666 are consecutive numbers, making them perfect for the Doubles Plus One strategy.

Step 2, identify the doubles fact to use. Since 5+5=105 + 5 = 105+5=10, we can use this as our doubles fact.

Step 3, break down the addition problem: 5+6=5+(5+1)=(5+5)+1=10+1=115 + 6 = 5 + (5+1) = (5+5) + 1 = 10 + 1 = 115+6=5+(5+1)=(5+5)+1=10+1=11

Step 4, You can verify your answer by counting up: 5,6,7,8,9,10,115, 6, 7, 8, 9, 10, 115,6,7,8,9,10,11.

Example 3: Larger Numbers with Doubles Plus One Problem:

Problem: Solve these equations using Doubles Plus One:

101+100=?101 + 100 = ?101+100=? 40+41=?40 + 41 = ?40+41=? Step-by-step solution:

Step 1, for 101+100101 + 100101+100:

First, note that 101101101 is one more than 100100100, making this a perfect Doubles Plus One situation (but in reverse order). Identify the doubles fact: 100+100=200100 + 100 = 200100+100=200 Apply Doubles Plus One: 101+100=(100+1)+100=100+100+1=200+1=201101 + 100 = (100+1) + 100 = 100 + 100 + 1 = 200 + 1 = 201101+100=(100+1)+100=100+100+1=200+1=201

Step 2, for 40+4140 + 4140+41:

First, recognize that 414141 is one more than 404040. Identify the doubles fact: 40+40=8040 + 40 = 8040+40=80 Apply Doubles Plus One: 40+41=40+(40+1)=40+40+1=80+1=8140 + 41 = 40 + (40+1) = 40 + 40 + 1 = 80 + 1 = 8140+41=40+(40+1)=40+40+1=80+1=81

Notice: This strategy works for numbers of any size, making mental math calculations faster!

Comments(7)SSoftballDevoteeTheoNovember 4, 2025I've used the doubles plus 1 strategy with my students, and it's made adding consecutive numbers so much easier for them! Great resource.

NNatureLover75September 17, 2025I’ve been using the Doubles Plus 1 strategy with my students, and it’s been a game-changer! The clear examples on this page helped me explain it better, and the kids are catching on quickly. Highly recommend for teaching addition!

MCMs. CarterSeptember 10, 2025I’ve been using the Doubles Plus 1 strategy with my 2nd graders, and it’s been a game-changer! The clear definition and examples really helped me explain it better, and the kids love how simple it makes adding consecutive numbers.

NNatureLover85August 27, 2025I’ve been using the Doubles Plus 1 strategy with my kids, and it’s been a game-changer for their mental math! The examples on this page made it so easy to explain. Highly recommend it for building number sense.

MCMs. CarterAugust 21, 2025I’ve been using the Doubles Plus 1 strategy with my 2nd graders, and it’s been a game-changer! The examples on the site made it super easy to explain. My students love how quick and fun math feels now!

svg]:px-3 dk:w-auto h-10 dk:h-14 rounded-lg dk:rounded-[15px] px-5 dk:px-7.5 text-sm dk:text-xl text-[#3467FF] bg-white hover:bg-white">Load MoreExplore More TermsPopulationCircumference of A CircleRational NumbersSlope Intercept Form of A LineCube NumbersLiters to Gallons ConversionView All Math TermsRecommended Interactive LessonsWord Problems: Subtraction within 1,0003Math3.NBT.A.2Find Equivalent Fractions of Whole Numbers3Math3.NF.A.3dMultiply by 73Math3.OA.C.7Word Problems: Addition and Subtraction within 1,0003Math3.NBT.A.2Identify and Describe Addition Patterns3Math3.OA.D.9Compare Same Numerator Fractions Using Pizza Models3Math3.NF.A.3dView All Interactive LessonsRecommended VideosAdd 0 And 1KMathK.OA.A.2, K.OA.A.5Compare Two-Digit Numbers1Math1.NBT.B.3Understand and Estimate Liquid Volume3Math3.MD.A.2Add Fractions With Like Denominators4Math4.NF.B.3aGenerate and Compare Patterns5Math5.OA.B.3Use Tape Diagrams to Represent and Solve Ratio Problems6Math6.RP.A.3View All VideosRecommended WorksheetsPerimeter of Rectangles4Math4.MD.A.3Use area model to multiply multi-digit numbers by one-digit numbers4Math4.NBT.B.5Measure Angles Using A Protractor4Math4.MD.C.6Multiply Mixed Numbers by Mixed Numbers5Math5.NF.B.4aWord problems: multiplication and division of fractions5Math5.NF.B.7cCompare and order fractions, decimals, and percents6Math6.RP.A.2View All WorksheetsRecommended Coloring PagesNumber 9 with small stars and one planet floating nearbyPre-K – KAll SubjectsTwo teddy bears hugging with a simple heart shape above their headsPre-K – KAll SubjectsRiverboat seen from the side with a single deckPre-K – KAll SubjectsAstronaut with helmet floating in space with stars1 – 2All SubjectsCeratosaurus walking past a volcano1 – 2All SubjectsHeart-shaped lollipop with a small teddy bear holding the stick1 – 2All SubjectsView All Coloring PagesRecommended BlogsCreative Teacher Appreciation Week Ideas That Make Educators Feel ValuedOctober 15, 2025When Homework Feels Impossible: A Parent's Guide to SuccessOctober 12, 20256 Things Every Parent Should Know When Tutoring Family Members at HomeOctober 7, 2025How to Communicate with People: 6 Essential Skills Every Child Should LearnSeptember 17, 2025Beautiful Sisters Quotes to Share Love and Build Stronger Family BondsSeptember 17, 2025How to Teach Kids to Treat Everyone with Respect: A Teacher's Practical GuideSeptember 17, 2025View All Blog PostsQUICK LINKSAbout UsPrivacy PolicyTerms of ServiceTOOLSHomework HelperGuide DesignerPodcast MakerPlan BuilderRESOURCESMath GlossaryEnglish GlossaryEnglish Language ArtsMathematicsScienceBook InsightsFun with WordsBlog© 2025 EDU.COM. All rights reserved.

智能索引记录