-

:.

:.

: .

75×75= 7+1 8×7 5625 =56 8 =

35×35= 3+1 4×3 1225 =4 =12

:

)

(

.

:

.

-

:

:

:

54×54= (4)2 25+4 2916 =16 =29

57×57= (7)2 25+7 3249 =49 =32

=

52×52= (2)2 25+2 2704 =04 =27

53×53= (3)2 25+3 2809 =09 =28

: :

!

.

:

) ( =] [.

-

!

:.

:.

:

.

: .

16×13= 16+3 190 6×3 190+18 =19 =18 =208

15×17= 15+7 220 5× 7 220+35 =22 =35 =255

: .

.

: .

.

.

-

:

:

:)(

.=

:

:

106× 104= 1 04+06 04×06 11024 =10 =24

107× 102= 1 07+02 07× 02 10914 =09 =14

.

)(.

111×121= 1 21+11 21×11 13431 =32 =231 32+2 31

: =[]

) (

) ( .) () () (

.

-

:

(21)2 - (20)2=21+20 .

:

: :):=- ().(

:

:

(41)2= (40)2 41+40 1600+81 1681 =1600 =81

(71)2= (70)2 71+70 4900+141 5041 =1400 =141

:

) (

. :

.

-...

:

:

:

30 ÷ 1.5= (30× 2) ÷ (1.5×2) 60÷3 20

90÷4.5=

26÷6.5=

1.5×26=

4.5×12=

12×

12×

4.5=

6.5=

1.5×26=

4.5×12=

!

26= 26

105= 105

(90× 2) ÷

(26× 2) ÷

.

1.5×2

=3 =13

4.5×2

=9 =6

26= 26×10 =260 =

105= 105 ×10 =1050 =210

÷

(4.5× 2)

÷

(6.5× 2)

26÷2=3 =13

12÷2=9 =6

×10

=260 =

×10

=1050 =210

180

52

26÷2

=3 =13

12÷2

=9 =6

26×2

=260 =52

105×2

=1050 =210

.

180÷9

52÷13

3×13

9×6

=9 =6

260+52

1050

20

4

3×13

260+52

1050+ 210

39

54

312

1260

.

312

1260

-

-

:

.

.

-

:)(

:)(

:

9× 15= 15× 10 150-15 135 =150

9× 68= 68× 10 680-68 612 =680

: )( :» !).) (( :»!

) (.» :» !) (

.«

: !!

!

-

:

:)(

:

:

14× 16= 16-14=2 (15)2 225-1 224 =225 =244

39× 41= 41-39=2 (40)2 1600-1 1599 =1600 =1599

: ) (

.

: :»«

!

-

//

:

.:

7×101= 707 9×101= 909

.:

59×101= 5959 32×101= 3232

× =

× =

159×1001= 159159 789×1001= 789789

: :»

.«

:

) (.

-

:)(.

: )(.

:.

99×24= 24-1 100-24 2376 =23 =76

: ) (

) (.

: ) (

!

-

:)(

:

) (

:

18×1.5= 18÷2 9+18 27 =9 =27

.

30×15= 30÷2 15+30 45× 10 450 =15 =45 =450

:

!

.

: ) (

.

) (.

-

:

:

:

:

62×11= 6 2 6(6+2)2 6(8)2 682

:

68×11= 6 8 6(6+8)8 7(4)8 748 72×11= 7 2 7(7+2)2 7(9)2 792

76×11= 7 6 7(7+6)6 8(3)6 836 : .

: ) (.

-

:)(

:)(

:

106 ÷

5= 106×2 212÷10

21.2

56 ÷

5= 56×2 112÷10

11.2

61 ÷

5= 61×2 122÷10

12.2

:

) (

!

) ( =][!

-

:)(.

.

:.

84×5= 84÷2

42×10 420

53×5= 53÷2 26.5×10 265

42×5= 42÷2

21×10 210 : : .

) (.

:» !.«

-.

:

:

)(

:

:

34×14= 34-14=20 (24)2 576-100 476 =576 =476

36×56= 56-36 =20 (46)2 2116-100 2016 =2116 =2016

.

...

.

(46)2 - (45)2= 46+45 (25)2 - (24)2= 25+ 24

(46)2 = (45)2+46+45 (24)2= (25)2 -25-24 :

!

: ) (

.

-

:

:..)(

:.

:

36×26= 36-26=10 (31)2 961-25 936 =961 =936

22×12= 22-12=10 (17)2 289-25 264 =289 =264

: :») (

.«

:

) (.

-

:

:.. .)(

:.

:

22×18= 22-18=4 (20)2 400-4 396 =400 =396

42×38= 42-38=4 (40)2 1600-4 1596 =1600 =1596

67×63= 63-67=4 (65)2 4225-4 4221 =4225 =4221

)(.

.

.