Standard Form & Significant Figures

Round 1.64239 to 2 significant figures

• 1.6

• 1.0

• 1.64

• 1.63

Round 22.843 to 2 significant figures

• 22.84

• 22.80

• 22.8

• 23

Round 143.93999 to 1 signigicant figure

• 140

• 143.9

• 144

• 100

A student rounds 168.9 to 170. They have rounded it to ____________.

• 1 significant figure

• 2 significant figures

• 3 significant figures

• 1 decimal place

Another student round 124.3 to 4 significant figures. There answer is ______________________.

• 124.3000

• 120

• 124.3

• 120

What is 1300 to standard form?

• $1.3\ \times10^3$

• $13\ \times10^2$

• $13\times100$

• $130\ \times10$

What is 432 in standard form?

• $43.2\ \times10$

• $4.32\ \times10^2$

• $0.432\times10^3$

• $432\ \times10^0$

What is 61 in standard form?

• $61\times10^0$

• $0.61\times10^2$

• $6.1\times10^1$

• $610\times10^{-1}$

What's wrong with this?
 $19\times10^4=190,000$  

• The number 19 should be between 1-10

• You can't have a power of 4 in standard form

• The power of 10 is wrong

• The number shouldn't be 19

 $6.1425\times15^3=6142.5$  

What's wrong with this?

• You can't put decimals like 6142.5 into standard form

• 1.82 should be 1.8

• Standard form should involve powers of 10, not powers of 15

• You can't have an odd power of ten like 3