Year 9 review

Rounding numbers

100

Round off 

39.794 

to 1 decimal place.

39.8

200

Round off 

86.224 

to 2 decimal places

86.22

300

Round off 

3323.3951 

to 2 decimal places

332.40

400

Round off 

1.8796 

to 3 decimal places

1.880

500

Round off 

33.2832 

to 3 decimal places

33.283

Scientific Notation

100

Express 

2.8 x 10³ 

as a basic numeral

2800

200

Express 

5.5 x 10^-2 

as a basic numeral

0.055

300

Express 

3.55 x 10^-2 

as a basic numeral

0.0355

400

Express 

6.89 x 10⁶ 

as a basic numeral

6,800,000

500

Express 

3.2 x 10 ^-8 

as a basic numeral

0.000000032

Significant Figures

100

Write the number of significant figures used in the expression 

"$1.2 million was spent"

2

200

Round 

2391 

to 3 significant figures

2390

300

Round 

19.2534 

to 4 significant figures

19.25

400

Round 

0.0093821 

to 2 significant figures

0.0094

500

Write 388,275,000 

in scientific notation to 3 significant figures

______ x 10 ^_

3.88 x 10⁸

Algebra 1

100

Factorise 

2a + 6 = ☐(a+3)

2(a=3)

200

What is the highest common factor of 14ab and 12ab?

a) ab     b) 14    c) 2ab    d) a²b²

c) 2ab

300

Factorise fully 

4m-8

4(m-2)

400

Factorise fully   

8y-32a

8(y-4a)

500

Factorise fully

7𝑥-12𝑥²

𝑥(7-12𝑥)

Algebra 2

100

Expand:

2(b+3)

2b+6

200

Expand

6(2-𝑥)

12-6𝑥

300

Expand and simplify

3(2a +8) +12

6a + 36

400

Expand 

4(7 - 5c)

28 - 20c

500

Expand 

3(2a + 4b – c)

6a +12b – 3c