Math Chapter 1.1 Form 1 by Kelvin
Transcript of Math Chapter 1.1 Form 1 by Kelvin
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Mathematics – Form 1
Chapter 1.1
By Kelvin
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WHOLE NUMBE!
1. Whole n"m#ers are $%1%&%'%(%)%*%+%,%-%1$%11%1&%....
&. /ero0 is the rst 2hole n"m#er.
'. Whole n"m#ers can #e 2ritten in 2or3s or 4"res.
(. Each 2hole n"m#er is ma3e "p o5 the 3i4its 5rom $to -.
For e7ample89
a0 '$( is ma3e "p o5 the 3i4its '%$ an3 (.
:t is rea3 as ;three h"n3re3 an3 5o"r;.
#0 (&*' is ma3e "p o5 the 3i4its (% &% * an3 '.
:t is rea3 as ;5o"r tho"san3 t2o h"n3re3
an3 si7ty9three;
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<0 =lace >al"e an3 >al"e o5 Each ?i4it inWhole N"m#ers.
1. Each 3i4it in a 2hole n"m#er has its o2nplace val"e.
&. @he place val"es 5or 2hole n"m#ers incl"3e"nits ones% tens% h"n3re3% tho"san3%
h"n3re3% tho"san3% ten tho"san3% millionsan3 so on.
'. @he val"e o5 a 3i4it in a 2hole n"m#er3epen3s on its place val"e.
) -+& ('* is rea3 as ;ve million nineh"n3re3 an3 seventy95o"r
tho"san3 t2o h"n3re3 an3 thirty 9si7.
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WorAe3 E7ample
Write the 5ollo2in4 in 2or3s.
a0 )'$ &+(
!ol"tion
a0 ve h"n3re3 an3 thirty tho"san3 t2o
h"n3re3 an3 seventy95o"r.WorAe3 E7ample
Write the 5ollo2in4 in 4"res.
a0 ve tho"san3 si7 h"n3re3 an3 t2enty9
5o"r.
!ol"tion
a0 ) *&(
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WorAe3 E7ample
!tate the place val"e o5 3i4it + in each o5 the 5ollo2in4
n"m#ers.
a0 )+' c0 '$+ ,(&
#0 - +$( 30 + -)1 *)$
!ol"tion
a0 ten c0 tho"san3
#0 h"n3re3 30 millionsWorAe3 E7ample
!tate the val"e o5 3i4it - in each o5 the 5ollo2in4 n"m#ers.
a0 '-1 c0 &- +1$
#0 - $$( 30 ( -)1 *)$!ol"tion
a0 -$ c0 - $$$
#0 - $$$ 30 -$$ $$$
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B0 o"n3in4 o N"m#ers
< n"m#er can #e ro"n3e3 o to a certain
place val"e #y 5ollo2in4 the r"les #elo2. LooA at the 3i4it on the ri4ht
ne7t to the place val"e involve3.
a0 :5 the 3i4it is ) more% a33 1 to the 3i4it at
the place val"e involve3 an3replace all the other 3i4its on its ri4ht 2ith
eros.
#0 :5 the 3i4it is less than )% retain the 3i4it asit is at the place val"e
involve3 an3 replace the other 3i4its on itsri4ht 2ith eros.
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c)Estimation1.Inour daily life, we useestimatio nwhen an accurateansweris unnecessary.
2. We of t enuserounding of f t ogiveanes t imat iont o t heac t ualvalue.
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<??:@:ON
OF WHOLE NUMBE!.
<0 <33ition
1. <33ition is a process o5 n3in4 thetotal o5 t2o or more n"m#ers.
&. @he total is also Ano2n as the s"m.
For e7ample89
@he s"m o5 '$$ an3 ) $$$ is ) '$$.'. @he or3er o5 a33ition o5 n"m#ers
3oes not chan4e s"m.
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4.The sum of any number and 0 is the numberitself. For example:-
(a) 12 0 ! 12
(b) 0 " ! "#. Follo$ the steps belo$ $hen %arryin& outaddition. 'tep 1:- rran&e the numbers a%%ordin& totheir pla%e alues. 'tep 2:- dd from ri&ht to left.
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B0 =ro#lem !olvin4 involvin4 <33ition
WorAe3 E7ample
@here are &) apples% ' +*$ 3"rians an3 -(, oran4es inMr @an;s stall.
Fin3 the total n"m#er o5 5r"its in his stall.
!ol"tion
1. Un3erstan3 the pro#lem Diven in5ormation89
N"m#er o5 apples &)
N"m#er o5 3"rian ' +*$
N"m#er o5 oran4es - (, Fin389 @otal n"m#er o5 5r"its
&. ?evise a plan
Use a33ition.
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*. +arry out the plan.
4. +he%, dd a&ain to see if the ans$eris the same.