Let’s just get this out of the way: I’m bad at math. Which is probably why I’m so interested in computers. In sixth grade I learned BASIC so that I could program my computer to do my math homework for me. Fast forward a bunch of years, and Siri makes it ridiculously easy to manipulate numbers.

1. **Simple arithmetic**. You can ask Siri to multiply, divide, add, or subtract two numbers. Here is what happens when I ask “What is two thirds times one point five?”

2. **Fractions**. I remember something from school about denominators. But I can just ask Siri to figure it out for me.

3. **Area**. Siri remembers lots of digits of pi and can calculate the area of a circle far more accurately than you can in your head. Strangely, I couldn’t get Siri to calculate the area of a circle based on radius, only diameter.

4. **Cooking measurements**. Need to find out how many tablespoons are in ¾ cup or how many fluid ounces a teaspoon is? Siri knows.

5. **Advanced math functions**. Siri knows square roots. And probably other things I don’t know to ask.

6. **Averages**. Just make sure to separate your numbers with “and” so that Siri knows the difference between “100, 50” and “150”.

7. **Scientific facts**. Siri knows such facts as the radius of the moon, the speed of light, and the boiling point of water.

8. **Measurement conversions**. Having grown up between the US and Canada, imperial units of measurement have always perplexed me.

9. **Currency conversions**. Siri can even make calculations using the current exchange rate.

10. **Time differentials**. Want to know how long you’ve worked today? Give your start and end times to Siri.

11. **Time to a particular date**. Get the number of hours or days to count down to Christmas or New Year’s.

12. **Combinations**. Try throwing more complex manipulations at Siri.