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Lesson: Multiplication by 9s

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Lesson: Multiplication by 9s

Multiplication by Series of 9s

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Lesson: Multiplication by 9s

Magical Number 9

Multiplication by 99

Multiplication by 999

Multiplication by more

number of 9s

Multiplication by Series of 9s

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Lesson: Multiplication by 9s

Magical Number 9

Multiplication by 99

Multiplication by 999

Multiplication by more

number of 9s

Multiplication by Series of 9s

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Lesson: Multiplication by 9s

Multiplication of Lesser Number of Digits

Multiplication of Equal Digits

Simple Pattern for any series of 9s

Unique Number

Magical Number 9

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Lesson: Multiplication by 9s

Magical Number 9

Multiplication by 99

Multiplication by 999

Multiplication by more

number of 9s

Multiplication by Series of 9s

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Lesson: Multiplication by 9s

Multiplication by 99

Test YourselfMultiplication by 99

• Solve it the conventional way

• Record time taken by you to do solve these

• Keep a pen and paper ready

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Lesson: Multiplication by 9s

Test YourselfMultiplication by 99

• Solve it the conventional way

• Record time taken by you to do solve these

• Keep a pen and paper ready

Multiplication by 99

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Lesson: Multiplication by 9s

Note: Equal number of digits of 9s

3 8 x 9 9

Multiplication by 99

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Lesson: Multiplication by 9s

Subtract each digit of 37 from 9: / 62

Answer is divided into two parts: __ /__

38 x 99

Subtract from : 37 /__

So, 38 x 99 = 37/62

1

= 3762

Not 38

2

1 3 8

9-3 9-7 6 2= =3

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Lesson: Multiplication by 9s

Subtract each digit of 58 from 9: / 41

Answer is divided into two parts: __ /__

59 x 99

Subtract from : 58 /__

So, 59 x 99 = 58/41

1

= 5841

Not 59

2

1 5 9

9-5 9-8 4 1= =3

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Lesson: Multiplication by 9s

Subtract each digit of 69 from 9: / 30

Answer is divided into two parts: __ /__

70 x 99

Subtract from : 69 /__

So, 70 x 99 = 69/30

1

= 6930

Not 70

2

1 7 0

9-6 9-9 3 0= =3

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Lesson: Multiplication by 9s

27 x 99

Subtract 1 from 27 : 26 /__

Subtract each digit of 26 from 9: / 73

So, 27 x 99 = 2673

2

1

3

= 2673

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Lesson: Multiplication by 9s

61 x 99

Subtract 1 from 61 : 60 /__

Subtract each digit of 60 from 9: / 39

So, 61 x 99 = 6039

2

3

1

= 6039

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Lesson: Multiplication by 9s

85 x 99

Subtract 1 from 85 : 84 /__

Subtract each digit of 84 from 9: / 15

So, 85 x 99 = 8415

2

1

3

= 8415

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Lesson: Multiplication by 9s

40 x 99

Subtract 1 from 40 : 39 /__

Subtract each digit of 39 from 9: / 60

So, 40 x 99 = 3960

2

1

3

= 3960

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Lesson: Multiplication by 9s

67 x 99

Subtract 1 from 67 : 66 /__

Subtract each digit of 66 from 9: / 33

So, 67 x 99 = 6633

2

1

3

= 6633

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Lesson: Multiplication by 9s

Multiplication by 99

We do not do any multiplication; we only subtract !

Second part of answer comes from first part !!

You can start writing the answer from left to right !!!

2

1

3

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Lesson: Multiplication by 9s

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Multiplication by 99

Quiz Time

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Lesson: Multiplication by 9s

Please solve the quiz and rate yourself

All the Best !!!

Quiz Time

Multiplication by 99

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Lesson: Multiplication by 9s

Magical Number 9

Multiplication by 99

Multiplication by 999

Multiplication by more

number of 9s

Multiplication by Series of 9s

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Lesson: Multiplication by 9s

756 x 999

Subtract 1 from 756 : 755 /__

Subtract each digit of 755 from 9: / 244

So, 756 x 999 = 755244

2

1

3

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Lesson: Multiplication by 9s

371 x 999

Subtract 1 from 371 : 370 /__

Subtract each digit of 370 from 9: / 629

So, 371 x 999 = 370629

2

1

3

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Lesson: Multiplication by 9s

Please solve the quiz and rate yourself

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Multiplication by 999

Quiz Time

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Lesson: Multiplication by 9s

Please solve the quiz and rate yourself

All the Best !!!

Quiz Time

Multiplication by 999

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Lesson: Multiplication by 9s

Magical Number 9

Multiplication by 99

Multiplication by 999

Multiplication by more

number of 9s

Multiplication by Series of 9s

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Lesson: Multiplication by 9s

75 x 999

Subtract 1 from 075 : 074 /__

Subtract each digit of 074 from 9: / 925

So, 75 x 999 = 074925 or 74925

3

2

4

Add 0 in front of 75 to get 0751

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Lesson: Multiplication by 9s

59 x 999

Subtract 1 from 059 : 058 /__

Subtract each digit of 058 from 9: / 941

So, 59 x 999 = 058941 or 58941

3

2

4

Add 0 in front of 59 to get 0591

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Lesson: Multiplication by 9s

This method works only when the

number of digits in the other

number is less than or equal to

the number of 9s!

Remember

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Lesson: Multiplication by 9s

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Multiplication by more number of 9s

Quiz Time

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Lesson: Multiplication by 9s

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Multiplication by more number of 9s

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Lesson: Multiplication by 9s

Multiplication by series of 9s

Multiplication of lesser number of digits with more number of 9s

Multiplication of equal number of digits with equal number of 9s

Summary of what we learnt

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Lesson: Multiplication by 9s

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Multiplication by any number of 9s

Quiz Time

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Lesson: Multiplication by 9s

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Quiz Time

Multiplication by any number of 9s

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Lesson: Multiplication by 9s

Multiplication by Less number of 9s

Multiplication by Series of 1s

You can also learn these lessons

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Lesson: Multiplication by 9s

End of Lesson

Multiplication by Series of 9s