G8

Grade 8 Unit 1 Lesson 7 P TE

Copyright © Swun Math

Student Practice

Unit 1 · Lesson 7: Estimate Irrational Numbers

Directions: Estimate the decimal value. Use a calculator to check.

1. √ 120

Solution:

between 10 and 11.

Calculator: √ 120 ≈10. 95

2. √

52

2

Solution:

between 3.5 and 4.

Calculator: √^522 ≈3.6

3. −√ 19

Solution:

between –4 and –5

Calculator: −√ 19 ≈− 4. 4

4. −√ 45

Solution:

between −7 and −6 or −7 <−√ 45 <− 6.

Calculator: −√ 45 ≅ − 6. 71

−√ 130

2

Solution:

between -5.5 and -6 or −6 <−√ 2130 <− 5 .5

Calculator: −1√ 2130 ≈−5.7

6. √

110

2

Solution:

between 5 and 6.

Calculator: √^1102 ≈5.2

Name: ___

Date: ___