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    ADDITION

    -The process of finding thesum of two or more number -If A and B are elements of Fthen, A + B = B + A-If A,B and are elements ofF,then !A + B" + = A + !B+ "

    SUBSTRACTION

    -The process of finding thedifference between two numbers-#rocess of finding the remainderwhen a smaller number is ta$enawa% from a bigger number&-The traditional names for the partsof the formula ' c ( b = a

    )A* F A IT./0TI

    #0 ATI

    MULTIPLICATION

    -simplified method of adding auantit% agi3en number of times&

    -if a and b are elements from F,then a4b is also element in F-if a,b,c are elements of F, then!a4b"4c = a4! b4c"-if a and b are elements of F thena4b = b4a-for elements a,b,c in F, a4!b+c" =!a4b" + !a4c"and !b+c"4a = !b4a" + !c4a"

    DIVISION

    -simplified method ofsubstracting a uantit% a gi3ennumber of time

    - 5i3ision is the process ofe ual grouping

    - 5i3ision is the process ofe ual sharing&

    6

    http://en.wikipedia.org/wiki/Formulahttp://en.wikipedia.org/wiki/Formula
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    DEFINITION

    7 The process of finding thesum of two or more number

    7 I f A and B are elements ofF then, A + B = B + A

    7 If A,B and areelements of F,then

    !A + B" + = A + !B+ "

    EXAMPLE

    Find the 3alue of 218 + 69:2

    olution '

    218 + 69:2 = ;>>;

    ADDITION

    HOW TO CALCULATE

    *rite one number under another so the unitnumerals are in the units columns !tens in tenscolumn,hundred in hundred column"

    Add all the numbers in the unit columns&*rite the results b% placing the unit number in theunit columns

    Add all numbers in the tens columns&*rite thelast numeral in this sum in the tens columns&

    ote'If this sum is greater than :,put the secondnumeral on the left in the hundred columns&

    ontinue to add each column of numbers&

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    A college has an enrolment of 68;? students&If 1?8 : of them are girls, how man% bo%s are there@

    umber of students ' 68;?umber of girls ' 1?8 :&Find the number of bo%s ' @

    68;? 1?8 : = 2

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    I)) T ATI C

    . * /ID05#0 ATI I

    05 I 5AI)E)IF0

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    EXAMPLE 1

    Eesterda%, /rs& Farah made 62? chocolate biscuits in the morning and another 2;9

    chocolate biscuits in the afternoon& 5uring a birthda% part%, 68 biscuits were eaten&

    .ow man% biscuits were left@

    Sol t!o" #

    First, understand the problem&

    umber of biscuits made ' 62? and another 2;9

    umber of biscuits eaten ' 68

    Find the number of biscuits left&

    econd, de3ise a plan&The operations to be carried out '

    Addition !+" and substraction !-"

    Third , carr% out the plan& *rite the number sentence '

    62? + 2;9 68 = >>>>>>>

    se the standard written method '

    1 6 12 62? ?92+ 2;9 - 68

    >>>>>>>>>>>> >>>>>>>>> >>>>> ?92>>> >>>2>>

    Answer ' 2

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    li$e birthda% shows an e3ent that we used all the mi ed operation in our dail%

    acti3ities

    EXAMPLE 2

    BaiGura has 6 bas$ets of watermelons& The bas$ets contain ;8, ;2, and 8