8th Math Chapter 6 Review

Adding /Subtracting

100

45.018 + 182.39

227.408

200

4 4/11-2 7/11

1 8/11

300

-6.28-0.395

-6.675

400

3/8 - 1/4 + 1/3

11/24

500

2 5/7 + 4 3/8

7 5/56

Multiplying /Dividing

100

49.2 xx 3.87

190.404

200

12.37 -: 4

3.0925

300

3/7 * 5/9

5/21

400

7/8 -: 19/20

35/38

500

3 1/4 xx 8

26

Supplementing

100

7.21 + b ; b=35.2

42.41

200

47/w ; w=5

9 2/5 or 9.4

300

4x + 2y; x=5/8 and y=3/7

47/14

400

2k - 2.617; k = 0.35

-1.917

500

-8/3(x + 2y); x = 7/3 and y = 4/9

-232/27

Like Terms

100

3/7x + 2/5x + 8 - 4/9

29/35x + 68/9

200

5/7(x + 2/3)+1/14

5/7x + 23/42

300

-4.15(a - 2b) + 6.4(-3a + b)

-23.35a + 14.7b

400

6/5y^2 + 3/7y + 4 - 1/2y^2 + y + 2/3

7/10y^2 + 10/7y + 14/3

500

x(3/2x - 2) + 6(5/2x - 2/3)

3/2x^2 + 13x - 4

Solving

100

x + 3.9 = 7.7

x = 3.8

200

x + 1/3 = 5/6

x = 1/2

300

2/9x = 2/3

x = 3

400

w/4.2 = 8.3

w = 34.86

500

7x + 1/7 = 4/7

x = 3/49

Scientific Notation

100

(3.52 xx 10^8) + (6.99 xx 10^8)

1.051 xx 10^9

200

(3.69 xx 10^-8)(1.9 xx 10^-6)

7.011 xx 10^-14

300

(2.9 xx 10^-6) - (1.2 xx 10^-6)

1.7 xx 10^-6

400

(8.7 xx 10^5) -: (2.1 xx 10^8)

4.14 xx 10^-3

500

(8.4 xx 10^9) + (2.7 xx 10^8)

8.67 xx 10^9