Question

3 jalen practiced piano for 9 hours each week for 18 weeks to prepare for his next recital. about how many hours did he practice in all? a close to but a little less than 160 hours b close to but a little more than 160 hours c a lot less than 160 hours d a lot more than 160 hours 5.ce.1a 4 431 students are attending the school assembly. only 7 chairs can fit in each row. the school custodian estimated how many rows of chairs would be needed for each student to have a seat. which estimate should the custodian use to make sure there are enough rows of chairs? a 490 ÷ 7 b 430 ÷ 10 c 400 ÷ 10 d 420 ÷ 7

Explanation:

3.

Step1: Multiply hours per week by weeks

$9\times18 = 162$

Step1: To ensure enough seats, round up 431.

431 is close to 490 when rounding up for an estimate to guarantee enough rows. We divide by the number of chairs per row (7).

Answer:

B. close to but a little more than 160 hours

4.