## BEATCALC:  Beat the Calculator!

Back to Calculation Tips & Tricks

 From B. Lee Clay

Squaring Numbers

Multiplying Numbers

Dividing Numbers

Subtracting Numbers

Finding Percents

Calculation
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### Multiplying a repeating 9's number by 33

1. Choose a repeating 9's number (999, etc.)
2. Multiply it by 33
3. The product is:
- the first two digits are 32
- the next digits are repeating 9's (two fewer than repeating 9's in the original number)
- the final two digits are 67

#### Example:

1. If the first number is 999:
2. First two digits are 32.
3. Next digits are repeating 9's -- two fewer than repeating 9's in the original number: 9.
4. Last two digits are 67.
5. So 33 × 999 = 32967.

See the pattern?

1. Next pick is 99999:
2. First two digits are 32.
3. Next digits are repeating 9's -- two fewer than repeating 9's in the original number: 999.
4. Last two digits are 67.
5. So 33 × 99999 = 3299967.

With these three steps you will be able to give these large answers with ease.