Which of these everyday math tasks could you tackle without a calculator? (Select all that apply)

1. Determine if you can pay for two $10 items with a $25 gift card, including taxes.
2. Determine how much you should leave for a 20% tip at a restaurant.
3. Split that bill and tip equally among three people.
4. Determine how many 12x12-inch tiles you need to cover your kitchen floor.
5. Halve a recipe that calls for 2/3 of a cup of an ingredient.
6. Determine how much money to save each month to pay for a holiday a year from now.
7. Determine the chances you'll pull a king from a deck of cards.
8. Estimate how much you should you'll spend on gas on a 300-km road trip.
9. Determine how much more you'll pay in interest if your mortgage rate increases by 2 percentage points.

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