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-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&

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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 = ;>>;

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 '

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>>