In the past month where I needed to use basic arithmetic. I was organizing a potluck with my friends, and we decided to make a big fruit salad. I had to calculate how much fruit we needed based on the number of people attending and the serving size. It was important to make sure everyone got enough to enjoy. So, I did some quick math to determine the right amount of each fruit to buy. It turned out to be a delicious and refreshing addition to our gathering. Another example I had to calculate the tip at a restaurant The Crafty Crab. The bill came out to be $45.75, and I wanted to leave a 20% tip. To quickly find the tip amount, I mentally multiplied $45 by 0.2 which is the same as finding 10% and then doubling it)m. So, $45 x 0.2 is $9. Then, to find the total bill with the tip, I added $45 and $9, which gave me $54