- The sum of the ones digit equal to 10
- The other digits are the same

Steps:

- The tens digit multiply by another tens digit plus one. In this case, the tens digit is 4, hence we multiply 4 by 5. 4 x 5 = 20. The product will be the last two digits of the answer.
- The product of the ones digit of the two numbers will be the first two digit of the answer.

**Example 1**:

57 x 53 = ?

**Answer**:

5 x 6 = 30

7 x 3 = 21

57 x 53 = 3,021

**Example 2**:

81 x 89 = ?

**Answer**:

8 x 9 = 72

1 x 9 = 9

81 x 89 = 7,209

**Example 3**:

114 x 116 = ?

**Answer**:

11 x 12 = 132

4 x 6 = 24

114 x 116 = 13,224

## 0 comments:

## Post a Comment