LEAP 2025 Math Grade 8 Chapter 2

1 pt

1.

$\left(1\times {10}^{7}\right)\times \left(5\times {10}^{21}\right)=$

A

$2\times {10}^{15}$

B

$2\times {10}^{27}$

C

$5\times {10}^{147}$

D

$5\times {10}^{28}$

1 pt

2.

$\left(2.8\times {10}^{8}\right)\xf7\left(7\times {10}^{5}\right)=$

A

$4\times {10}^{12}$

B

$4\times {10}^{2}$

C

$4\times {10}^{35}$

D

$4\times {10}^{1.4}$

1 pt

7.

Miss Sheldon found a pint of ocean water contained beneficial bacteria numbering $1.7\times {10}^{5}$. Express this as a standard number.

A

17,000

B

170,000

C

1,700,000

D

17,000,000

1 pt

10.

Airplanes can go $4.9\times {10}^{2}$ miles per hour. If a flight between two secret locations is $1.2\times {10}^{4}$ miles, about how many hours will it take the airplane to get to its destination?

A

$24.5$ hours

B

$24.5\times {10}^{2}$ hours

C

$24.5\times {10}^{4}$ hours

D

$24.5\times {10}^{7}$ hours

1 pt

13.

$20\xf75\times {10}^{3}+4.1$

A

$4.{0041}^{3}\times 10$

B

$4.0041\times {10}^{3}$

C

$4.{0041}^{4}\times 10$

D

$4.0041\times {10}^{4}$