Example ( 1 ) : ( 1 2 ) 2 = = 14 ، 2 x 2 = Example ( 2 ) : ( 1 3 ) 2 = = 16،3 x 3 = Example ( 3 ) : ( 1 4 ) 2 = = 18 ، 4 x 4 = Example ( 4 ) : ( 1 5 ) 2 = = 20،5 x 5 = Square a Number مربعات الأعداد

Example ( 1 ) : ( 35 ) 2 = x 4 = 12 ، 5 x 5 = Example ( 2 ) : ( 75 ) 2 = x 8 = 56،5 x 5 = Example ( 3 ) : ( 125 ) 2 = x 1 3 = 156 ، 5 x 5 = Example ( 4 ) : ( 15 ) 2 = x 2 = 2،5 x 5 =

Example ( 1 ) : 1 3 x 1 3 = 1- square the first number 1 x 1 = 1 2- square 3 in the 133 x 3 = 9 3- know take 1x 3 = 3+3 (double) = Example ( 2 ) : 7 2 x 7 2 = 1- square the first number 7 x 7 = square 2 in the 72 2 x 2 = 4 3- know take 7x 2 = (double) = Example ( 3 ) : 6 3 x 6 3 = 1- square the first number 6 x 6 = square 3 in the 63 3 x 3 = 9 3- know take 6x 3 = (double) = Example ( 4) : 5 4 x 5 4 = 1- square the first number 5 x 5 = square 3 in the 54 4 x 4 = know take 5x 4 = (double) =

Example ( 1 ) : ( 95 ) 2 = = 90 ، 5 x 5 = Example ( 2 ) : ( 96 ) 2 = = 92،4 x 4 = Example ( 3 ) : ( 85 ) 2 = = 70 ، 15 x 15 = Example ( 4 ) : ( 88 ) 2 = = 76،12 x 12 =

Example ( 1 ) : ( 32 ) 2 = - - ( ) 2 = Example ( 2 ) : Example ( 3 ) : ( 5 1 ) 2 = ( 30 ) 2 = x 30 x 2 = 120 ( 2 ) 2 = ( 74 ) 2 = - - ( ) 2 = ( 70 ) 2 = x 70 x 4 = 560 ( 4 ) 2 = ( 50 ) 2 = x 50 x 1 = 100 ( 1 ) 2 =

( a 5 ) 2 = a 2 + a = ، 5 x 5 = Example ( 1 ) : ( 35 ) 2 = = 12،5 x 5 = Example ( 2 ) : ( 45 ) 2 = = 20 ، 5 x 5 = Example ( 3 ) : ( 65 ) 2 = = 42،5 x 5 =

Example ( 1 ) : ( 48 ) 2 = Example ( 2 ) : Example ( 3 ) : Example ( 4 ) : Smarter way to square any number between less than – 2 = 23 square 2 = ( 46 ) 2 = 4 less than – 4 = 21 square 4 = ( 37) 2 = less than – 13 = 12 square 13 = ( 40) 2 = less than – 10 = 15 square 10 = 100،

Example ( 5 ) : ( 52 ) 2 = Example ( 6 ) : Example ( 7 ) : Example ( 8 ) : 2 much more than = 27 square 2 = ( 57 ) 2 = 7 much more than = 32 square 7 = ( 60 ) 2 = much more than = 35 square 10 = ( 65 ) 2 = much more than = 40 square 15 = 225،

Multiplying a number less than 100 by x 98 = = 97 ، = Example ( 2 ) : 99 x 47 = = 46، = Example ( 3 ) : 99 x 4 = = 03 ، = Example ( 4 ) : 99 x 17 = = 16، = Example ( 1 ) :

Multiplying a number less than 100 Example ( 2 ) : ، Example ( 3 ) : ، Example ( 4 ) : ، Example ( 1 ) : – 2 = 95 ،2 x 3 = x 92 = x 97 = – 8 = 85 7 x 8 = x 91 = – 13 = x 9 = x 20 = – 80 = x 80 = ،

Multiplying a number between 11 to 19 Example ( 2 ) : Example ( 3 ) : Example ( 4 ) : Example ( 1 ) : 13 x 12 = x 19 x 15 = x 1 4 = x 11 = x 17 x 13 = x 12 =221 Example ( 5 ) : 12 x 15 = x 1 = 180 Example ( 6 ) : 18 x 19 = x 17 =342 Example ( 7 ) : 12 x 12 = x Example ( 4 ) : 14 x 13 = x 1 =182

Example ( 1 ) : 3563 x 11 = Example ( 2 ) : Example ( 3 ) : How to multiply any number by 11 Copy the first digit = = = 9 At the end copy the last digit x 11 = Copy the first digit = = = 7 At the end copy the last digit x 11 = Copy the first digit = = = = 5 At the end copy the last digit

Example ( 1 ) : 1332 x 12 = Example ( 2 ) : Example ( 3 ) : How to multiply any number by 12 Copy the first digit 1 Double ( 1 ) + 3 = 5 Double the last digit ( 2 ) 4 Double ( 3 ) + 3 = 9 Double ( 3 ) + 2 = x 12 = Copy the first digit3 Double ( 3 ) + 5 = 11 Double ( 5 ) + 6 = 16 Double ( 6 ) + 3 = 15 Double the last digit ( 3 ) x 12 = Copy the first digit4 Double ( 4 ) + 2 = 10 Double ( 2 ) + 1 = 5 Double ( 1 ) + 6 = 8 Double the last digit ( 6 )

Example ( 1 ) : 1332 x 13 = Example ( 2 ) : Example ( 3 ) : How to multiply any number by 13 Copy the first digit 1 Triple ( 1 ) + 3 = = 6 Triple the last digit ( 2 ) 6 Triple ( 3 ) + 3 = = 12 Triple ( 3 ) + 2 = = x 13 = Copy the first digit1 3 Triple ( 1 ) + 2 = = 5 Triple ( 2 ) + 2 = = 8 Triple ( 2 ) + 3 = = 9 Triple ( 3 ) + 1 = = 10 Triple the last digit ( 1 ) x 13 = Copy the first digit 1 Triple ( 1 ) + 1 = = 4 Triple the last digit ( 1 )

Multiplying using base 10 8 x 7 = - ، Example ( 2 ) : ، Example ( 3 ) : Example ( 4 ) : Example ( 1 ) : – 2 = 5 2 x 3 = – 3 = 5 2 x 3 = x 6 = - 9 – 4 = x 4 = – 1 = 5 1 x 4 = x 4 = – 3 = 1 3 x 6 = – 6 = 1 3 x 6 = x 3 = - ، – 7 = x 7 = 56 6 ، 3 – 8 = x 7 = 56 6

Example ( 1 ) : Example ( 2 ) : Example ( 3 ) : How to multiply a number by 5 36 x5= x5= Example ( 4 ) : x5 = The trick is : divide by 2Multiply by 10 = x5 = ÷ ÷ ÷ ÷ ÷ 2 = = = = = 1212 x 10 = x 10 = x 10 = x 10 = 75 Example ( 5 ) : 18x5 2= 99 x 10 = 90

Example ( 1 ) : Example ( 2 ) : Example ( 3 ) : Example ( 4 ) : Divide a number by 5 24÷5= = ÷5= + = ÷5= = ÷5= = Example ( 5 ) : 67÷5 = =

Convert from Centigrade to Fahrenheit Example ( 2 ) : Example ( 3 ) : Example ( 1 ) : 22 ° C ° F = = ° C° F74 32 ° C ° F = = ° C 94 ° F 19 ° C- - -° F = = ° C° F68