- Choose a 2-digit number ending in 8.
- The last digit of the answer is always 4: _ _ _ 4
- Multiply the first digit by 6 and add 6 (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
**78**: - The last digit of the answer is 4: _ _ _ 4
- Multiply the first digit (7) by 6 and add 6 (keep the

carry): 7 × 6 = 42, 42 + 6 = 48; the next digit of the

answer is 8 (keep carry 4): _ _ 8 4 - Multiply the first digit (7) by the next number (8)

and add the carry (4):

7 × 8 = 56, 56 + 4 = 60 (the first two digits): 6 0 _ _ - So
**78 × 78 = 6084**.

** See the pattern?**

- For 38 × 38
- The last digit of the answer is 4: _ _ _ 4
- Multiply the first digit (3) by 6 and add 6 (keep the

carry): 3 × 6 = 18, 18 + 6 = 24; the next digit of the

answer is 4 (keep carry 2): _ _ 4 4 - Multiply the first digit (3) by the next number (4)

and add the carry (2):

3 × 4 = 12, 12 + 2 = 14 (the first two digits): 1 4 _ _ - So
**38 × 38 = 1444**

Learn the pattern,practice other examples, and you will be a whiz at giving these squares.

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