- Choose a 2-digit number ending in 6.
- Square the second digit (keep the carry): the last digit

of the answer is always 6: _ _ _ 6 - Multiply the first digit by 2 and add the carry

(keep the carry): _ _ X _ - Multiply the first digit by the next consecutive number and

add the carry: the product is the first two digits:

XX _ _.

#### Example:

- If the number is
**46**, square the second digit :

6 × 6 = 36; the last digit of the answer is 6

(keep carry 3): _ _ _ 6 - Multiply the first digit (4) by 2 and add the carry

(keep the carry): 2 × 4 = 8, 8 + 3 = 11; the next digit

of the answer is 1: _ _ 1 6 - Multiply the first digit (4) by the next number (5)

and add the carry: 4 × 5 = 20, 20 + 1 = 21

(the first two digits): 2 1 _ _ - So
**46 × 46 = 2116**.

** See the pattern?**

- For 76 × 76, square 6 and keep the carry (3):

6 × 6 = 36; the last digit of the answer is 6: _ _ _ 6 - Multiply the first digit (7) by 2 and add the carry:

2 × 7 = 14, 14 + 3 = 17; the next digit of the answer

is 7 (keep carry 1): _ _ 7 6 - Multiply the first digit (7) by the next number (8)

and add the carry: 7 × 8 = 56, 56 + 1 = 57

(the first two digits: 5 7 _ _ - So
**76 × 76 = 5776**.

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