Rounding

Rounding to Decimal Places

100

23.45 to 1 dp

23.5

200

9.844 to 2 d.p

9.84

300

0.0452 to 3 d.p

5.9

400

71.992 to 2 d.p

71.99

500

8.141573 to 4 d.p

8.1416

Random

100

What is the rule of rounding?

If it's 5 or above, round up. 

200

Name the first three whole place value columns.

Hundreds, Tens and Units. 

300

Name the first three decimal number places. 

Tenths, Hundredths and Thousandths. 

400

What is the simple called that separates digits. 

Decimal. 

500

What do you do if a number is less than 5? 

Round down. 

Identifying Significant Figures

100

What is the first significant figure in the number 2314?

2

200

Identify the number of significant figures: 0.00000000001

1

300

What is the second significant figure in the number 43879?

3

400

What is the second significant figure in the number 0.3759?

7

500

What is important to remember when rounding to significant figures?

Place Value

Rounding to Significant Figures

100

What is 709 rounded to one significant figure?

700

200

What is 0.94 rounded to one significant figure?

0.9

300

What is rounded 2540 to two significant figures?

2500

400

What is 0.578 rounded to two significant figures?

0.58

500

What is 1.068 rounded to two significant figures?

1.1

Represent in Standard Form

100

380 000

3.8 x10⁵

200

914 000 000

9.14 x 10⁸

300

0.0004

4 x 10^-4

400

0.001 12

1.12 x 10^-3

500

0.000 000 000 053

5.3 x 10^-11