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- Keenya and her sister went to a concert in the park with her parents. People sat on benches in rows. Keenya counted 12 people in the first row. There were 9 rows.
- Keenya thought, “There are about 10 people in each of the 9 rows. There are about . . .” Finish Keenya's statement using 10 as a convenient number.
- Keenya's sister thought, “There are about 10 rows and about 10 people in each row. I'd say there are about . . .” Finish her statement. What convenient numbers did Keenya's sister use to make her estimate?
- At the grocery store, Jackie and her brother choose some grapes and weigh them. The grapes weigh 3 pounds and 7 ounces. Grapes are on sale for 49¢ a pound (1 pound = 16 ounces). Jackie and her brother estimate the price of the grapes.
- Jackie's brother thinks, “3 pounds of grapes cost 3 50¢ or $1.50. 7 ounces is about
pound. If 1 pound costs 50¢, pound costs about 25¢. The grapes we picked should cost about . . .” Finish his statement. - If Jackie and her brother want to be sure they have enough money for the grapes, whose estimate would be better to use? Why do you think so?
- Michael's father travels 36 miles each way to work every day.
- About how many miles does he travel to and from work in one week (5 days)? Solve this problem in your head. Then, explain how you solved it. Be sure to tell what convenient numbers you used.
- Share your method with a classmate. What convenient numbers did your classmate choose?