Practice Page Uncertainty

Answer each of the questions below. For each problem, estimate and then find the actual answer.

 Sue went to the store to buy ten lemons. Lemons cost 2 for \$0.95. About how much did she pay? Then find the actual amount. Estimate: About \$5.00 Actual: \$4.75 Answer Two lemons cost about \$1.00. So each lemon will cost about \$0.50. Estimate: 10 x \$0.50= \$5.00 Actual cost = \$0.95 x 5 = \$4.75 Explanation

 Matt went to the grocery store to buy more lettuce for the salad. One bag of lettuce cost \$2.79. He gave the cashier \$5.00 to pay for the lettuce. Use estimation to help Matt know how much change he should receive. Then find the actual amount. Estimate: About \$2.00 Actual: \$2.21 Answer One bag of lettuce costs less than \$3.00. Estimate: \$5.00 - \$3.00 = \$2.00 Actual: \$5.00 - \$2.79 = \$2.21 Explanation

John won a \$1,000 gift certificate to a music store. He bought all the items on the list. Estimate to the nearest hundred, how much money John has left. Then find the actual amount.
 What John bought 2 guitars \$275 1 stereo system \$285

 Amber went to the pet shop with \$25 to spend. She spent \$4.95 on a fish, \$9.95 on a fish tank, and \$5.15 on fish food. About how much does she have left? Then find the actual amount. Answer Estimate: About \$5.00 Actual: \$4.95 You can round all money amounts to the nearest dollar. \$4.95 to \$5.00; \$9.95 to \$10.00; \$5.15 to \$5.00 \$5.00 + \$10.00 + \$5.00 = \$20.00 Estimation: \$25.00 - \$20.00 = \$5.00 Actual: \$4.95 + \$9.95 + \$5.15 = \$20.05 Actual: \$25.00 - \$20.05 = \$4.95 Explanation

 Nicole uses a pay phone to make a long distance call. It cost \$0.09 a minute. She talks for 30 minutes. Estimate how much the call will cost. Then solve to find the actual amount. Estimate: about \$3.00 Actual : \$2.70 Answer Round \$0.09 to \$0.10 Estimate: \$0.10 x 30 = \$3.00 Actual : \$0.09 x 30 = \$2.70 Explanation

 Remember: Is your answer reasonable? Make estimates to compare to actual results.