Name 1. Kim bought a doll for \( \$ 86.91 \). How much change should Kim receive if she gave the cashier \( \$ 90 \) ? (A) \( \$ 2.09 \) (B) \( \$ 3.09 \) (C) \( \$ 3.90 \) (D) \( \$ 4.09 \)

To find out how much change Kim should receive, subtract the cost of the doll from the amount she gave to the cashier: \[ 90 - 86.91 = 3.09. \] So, Kim should receive \( \$ 3.09 \). Choosing the right option, the answer is (B) \( \$ 3.09 \). When it comes to everyday transactions, it's essential to double-check your math to avoid mistakes like miscounting change. A quick tip is to always round your totals before making calculations—like estimating \( \$ 87 \) instead of \( \$ 86.91 \)—this gives you a rough idea to spot check your final answer! Speaking of rounding, did you know that rounding techniques are not just useful in shopping but also widely applied in budgeting and financial planning? Mastery in estimating can be a saving grace, allowing you to keep track of your finances effortlessly.