Loading...

9a x 9b

A strategy to multiply any two numbers between 90 and 99.

98 x 97 = 9506

How we got 9506

Step 1: Subtract each number from 100

100 - 98 = 2

100 - 97 = 3

Step 2: Do cross subtraction as indicated below

98 - 3 = 95 or

97 - 2 = 95

Either way, you end up with the same answer. This forms the first part of our answer: 95

Step 3: Finally multiply the two answers from step 1 to get the second part of our answer: 06

2 x 3 = 06

Note that we add an extra zero if the product is less than 10. Here the answer is 9506 and not 956.

95 x 98 = 9310

How we got 9310

Step 1: Subtract each number from 100

100 - 95 = 5

100 - 98 = 2

Step 2: Do cross subtraction as indicated below

95 - 2 = 93 or

98 - 5 = 93

Either way, you end up with the same answer. This forms the first part of our answer: 93

Step 3: Finally multiply the two answers from step 1 to get the second part of our answer: 10

5 x 2 = 10

94 x 90 = 8460

How we got 8460

Step 1: Subtract each number from 100

100 - 94 = 6

100 - 90 = 10

Step 2: Do cross subtraction as indicated below

94 - 10 = 84 or

90 - 6 = 84

Either way, you end up with the same answer. This forms the first part of our answer: 84

Step 3: Finally multiply the two answers from step 1 to get the second part of our answer: 60

6 x 10 = 60

99 x 99 = 9801

How we got 9801

Step 1: Subtract each number from 100

100 - 99 = 1

100 - 99 = 1

Step 2: Do cross subtraction as indicated below

99 - 1 = 98 or

99 - 1 = 98

Either way, you end up with the same answer. This forms the first part of our answer: 98

Step 3: Finally multiply the two answers from step 1 to get the second part of our answer: 01

1 x 1 = 01

Note that we add an extra zero if the product is less than 10. Here the answer is 9801 and not 981.

93 x 92 = 8556

How we got 8556

Step 1: Subtract each number from 100

100 - 93 = 7

100 - 92 = 8

Step 2: Do cross subtraction as indicated below

93 - 8 = 85 or

92 - 7 = 85

Either way, you end up with the same answer. This forms the first part of our answer: 85

Step 3: Finally multiply the two answers from step 1 to get the second part of our answer: 56

7 x 8 = 56

96 x 95 = 9120

How we got 9120

Step 1: Subtract each number from 100

100 - 96 = 4

100 - 95 = 5

Step 2: Do cross subtraction as indicated below

96 - 5 = 91 or

95 - 4 = 91

Either way, you end up with the same answer. This forms the first part of our answer: 91

Step 3: Finally multiply the two answers from step 1 to get the second part of our answer: 20

4 x 5 = 20