Year 7 Math Revision - T2 Number

Adding and Subtracting

100

What is 10-24

-14

200

What is -20-+5

-25

300

What is -14 - (-15)

1

400

What is 

sqrt9 - (-2)

5

500

What is 19 + (-10) - 11

-2

Discounts

100

What is 10% of 70

7

200

Lollies are $12 and have a 20% discount. How much are they?

10% = $1.2

20% = $2.4

= $12 - $2.4

= $9.6

300

Find the discount amount off a $120 bike at 55%

10% = $12

50% = $60

5% = $6

55% = $66

400

What is the new price of a Happy meal which was originally $5 but has a 20% staff discount?

10% = $0.5

20% = $1

= $5 - $1

= $4

500

A phone costs $250 but has a 1/5 discount. What is the discount amount?

250/1 times 1/5 = 250/5 = $50

Fraction Operations

100

1/4 + 2/4

3/4

200

6/10 - 1/5

6/10 - 2/10 = 4/10 or 2/5

300

2/6 times 6/9

(2 times 6)/(6 times 9) = 12/54 = 6/27 = 2/9

400

2/4 divide 2/5

2/4 times 5/2 = 10/8 = 1 2/8 = 1 1/4

500

1/3 + 1/18 + 3/9

(1 times 6)/(3 times 6) + 1/18 + (3 times 2)/(9 times 2) 

= 6/18 + 1/18 + 6/18 

= 13/18

Square Numbers and Roots

100

What is 

sqrt(16)?

4 times 4 = 16

sqrt16 = 4

200

What is 

5^2

5^2 = 5 times 5 = 25

300

A square room is 49m², what is its side lengths?

sqrt49 = 7

400

What is 

6^2 - 4^2

6^2 - 4^2 = 36 - 16 = 20

500

What is 

1/sqrt9+sqrt4/6

1/sqrt9 + sqrt4/6 = 1/3 + 2/6 = 2/6 + 2/6 = 4/6 or 2/3

Fraction, Decimal, Percentage

100

Convert 0.3 to a fraction

0.3 x 100 = 30

30/100

200

Convert 10% to a fraction

10/100 or 1/10

300

Convert

1/4

 to a decimal

(1 times 100)/4 = 100/4 = 25% = 0.25

400

Convert 21% to a decimal

21% = 0.21

500

What is 0.7 as a fraction

0.7 times 100 = 70/100