Math Shortcuts - numbers

Numbers

10,000 = hundred hundred
million = thousand thousand
billion = thousand million
trillion = million million

• 1% of 10k is 100. The Dow is roughly 10k (it’s about 12k now). So if the dow drops 100, it’s about a 1% loss.
• What’s 5k x 50k? That’s 250 * thousand * thousand or 250 million.

Source: Mental Math Shortcuts