mental math - So, you’re at a restaurant, and the bill arrives.
Question; can you figure out the 15% tip in your head?
How about calculating the cost of 2 movie tickets, so you know you have enough cash for snacks left over?
Can you figure that out without a calculator?
How about this; If a cashier makes a $12.00 error on your grocery bill, can you realize it right away because you already ran the numbers in your head?
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