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BISHOPSCOTTBOYS’SCHOOL(AffiliatedtoCBSE,NewDelhi)AffiliationNo.:330726,SchoolCampus:Chainpur,Jaganpura,By-Pass,Patna804453.PhoneNumber:7061717782,9798903550.,Web:www.bishopscottboysschool.com Email:[email protected]
ONLINESTUDYMATERIALSUBJECT-Maths
SESSION-2020-21
CLASS-II
CHAPTERNUMBER-3TOPIC:Subtraction
DAY-1
Subtopic-Subtractionconceptandproperties
NOTES
*Subtractionisamathematicaloperationthattellsusthedifferencebetweentwonumbers.
*Itistheoppositeorinverseoperationofaddition.
*Thesymbolforthisprocessis'-'minus.
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*Insubtraction,thegreaternumberiscalledminuendandsmallernumberiscalledsubtrahend.*Theanswerofsubtractioniscalleddifference.*Insubtraction,asubtrahendissubtractedfrom aminuendtofindadifference.*Forexample:Inthefollowingequation:-
5istheminuend1isthesubtrahend4isthedifference
*SubtractionFacts
1.Subtractionconsistsoftakingawayandcomparingconcepts.2.Subtractioncanbedonebythetakingaway,countingbackwardsandputtingnumbersincolumns.3.Differentwaysinwhichsubtractioncouldbeasked:a.Subtract2from 5.b.Takeaway2from 5.c.Findthedifferencebetween5and2.
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d.Whatmustbeaddedto2toget5?e.Byhowmuchis2lessthan5?f.5minus2.4.Thegreaternumberisalwayswrittenfirst.
Greaternumber-Smallernumber=DifferenceOr
Minuend-Subtrahend=Difference5.Wecannotchangetheorderofthenumbersinsubtraction.WealwaysSubtractthesmallernumberfromthegreaternumber.6.Westartsubtractingfrom theonesplace.
*PropertiesofSubtractionRemember1.Anynumber-0=ThesamenumberForexample,726-0=7262.Anynumber-1=It'spredecessorForexample,165-1=1643.Anynumber-itself=0Forexample,246-246=0
Videolinkhttps://youtu.be/NgXm1kaxnlI
Exercise-11.Fillintheblanks:-a._________________isthemathematicaloperationthattellsusthedifferencebetweentwonumbers.
b.Thesymbolofsubtractionis___.
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c.Insubtraction,thegreaternumberiscalled______________.
d.Theanswerofsubtractioniscalled_______________.
e.Subtractionistheoppositeorinverseoperationof_____________.
2.Subtractthefollowingnumbers:-
a.28-1=____
b.56-0=____
c.45-45=____
d.TO57
- 6------------------------
e.TO99
- 3-------------------
-------------------
f.TO66
- 5--------------------------
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DAY2
Subtopic-Subtractionof2-digitnumberswithoutborrowing
Notes
*InSubtraction,thegreaternumberisalwayswrittenabove.
*Subtract22from 57
Wewrite57-22=35. TO
Step1:Subtracttheonescolumn.(7-2=5). 57
Step2:Subtractthetenscolumn.(5-2=3). -2235
Videolinkhttps://www.khanacademy.org/math/arithmetic/arith-review-add-subtract/arith-review-subtract-within-100/v/subtracting-2-digit-numbers-without-regrouping
PPTLink
https://www.slideshare.net/mobile/nelhokhelajwinchanrak/3-subtracting-mentally-2-digit-numbers-without-regrouping
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Exercise:-2
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DAY-3
Subtopic:Subtractionof2-digitnumberwithborrowing:Notes
*Subtract18from 24Step1:Subtracttheonescolumn.Here4<8,sowecannotsubtract.Inthisconditionweborrow1tenfrom thenumber2inthetensplace.Nowitwillmake14inonescolumnand1tenintenscolumn.So,14-8=6.
Step2:Subtractthetenscolumn.1-1=0
TO24
-186
Videolink
https://youtu.be/pv8URIRgCdo
PPTlink
https://www.slideshare.net/mobile/KattStubbs/subtraction-with-regrouping-45158626
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Exercise-3
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DAY4
Subtopic-Subtractionof3-digitnumber(withoutborrowing):
NotesSubtract125from 199Step1:Arrangethenumbersaccordingtoplacevalue.
Step2:Subtracttheonescolumn.9-5=4ones
Step3:Subtractthetenscolumn.9-2=7tens
Step4:Subtractthehundredscolumn.1-1=0
H TO199
-125------------07 4
-------------
Videolinkhttps://youtu.be/i8r7ZTUqB9w
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Exercise4
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DAY5
Subtopic:Subtractionof3-digitNumberswithBorrowing
NotesIncaseof3-digitnumbers,weborrowfrom thetensandhundredscolumn.
Subtract136from 374Step-1Subtracttheones.Here4<6,sowecannotsubtract.Weborrow1tenfrom thenumber7inthetensplace.Nowitwillmake14inonescolumnand6tensintenscolumn.So,14-6=8.
Step-2Subtractthetenscolumn.(6-3=3)
Step-3Subtractthehundredscolumn.(3-1=2)
Therefore,374-136=238H TO3 74
-1 362 38
Videolinkhttps://www.khanacademy.org/math/cc-third-grade-math/imp-addition-and-subtraction/imp-subtracting-with-regrouping-within-1000/v/regrouping-when-subtracting-three-digit-numbers
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Exercise5
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*WordProblems/storysums
*Wordproblemsarestorieswecomeacrosseveryday.
*Somesubtractionwordsaregivenascluesthatweneedtosubtracttosolvethewordproblems.
*Tosolvethewordproblemsfollowingstepsshouldbefollowed:1.Readthewholeproblem
2.Readitslowlyandunderstandwhatistobefoundout.
3.Notedowntheinformationsinshortandsimplesentencescalledstatements.
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4.Makestatementaboutwhatyouneedtofind.
5.Decidewhichoperationtobeused.
6.Findoutyouranswer.
7.Donotforgettowritetheanswerinwordintheform ofstatement.
Forexample:
Q1.Therewere203notebooksinashop.132notebooksweresold.Howmanynotebooksareleftintheshop?Solution:Numberofnotebooksintheshop=203Numberofnotebookssold =132Numberofnotebooksareleft = 71
HTO203
-13271
Answer:71notebooksareleftintheshop.
Videolinkhttps://youtu.be/qdOUhPg172s
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Exercise:-5
*Solvethefollowingwordproblems:
1.Atraincarried100passengers.50passengersgotoffatthefirststation.Howmanypassengersareleftinthetrainnow?
2.Inaschoolthereare68teachers.Outofthese38areladyteachers.Findouthowmanymaleteachersarethere?
3.Avnihas87pencils.Shegave29pencilstohersister.Howmanypencilsareleftwithher?
OnlinetestLink
https://www.slideshare.net/mobile/theeducationdesk/maths-subtraction-worksheet-cbse-grade-ii
