Review 1
Draw nets for the following shapes:
a) Cube
b) Rectangular Prism
c) Triangular Prism
d) Tetrahedron
a) Cube
b) Rectangular Prism
c) Triangular Prism
d) Tetrahedron
Review 2
Write an expression for the following situations:
a) 3 times a number x 3x
b) A number 6 less than y y-6
c) A number y divided by 2 y/2
Write situations for these expressions
a) 7x 7 times a number x
b) x - 3 3 less than a number x
c) y/4 a number y divided by 4
John is x years old and Harry is 3 times older than John. Peter is 6 years older than Harry.
a) Write Peter's age in terms of x. 3x+6
b) If John is 12 years old, how old is Harry. 36
a) 3 times a number x 3x
b) A number 6 less than y y-6
c) A number y divided by 2 y/2
Write situations for these expressions
a) 7x 7 times a number x
b) x - 3 3 less than a number x
c) y/4 a number y divided by 4
John is x years old and Harry is 3 times older than John. Peter is 6 years older than Harry.
a) Write Peter's age in terms of x. 3x+6
b) If John is 12 years old, how old is Harry. 36
Review 3
a) If I buy a coke in Thailand for 42 Baht and the VAT included is 5%, how much do I pay for the actual product? 40 Baht
b) I bought a car for 1 000 000 baht after a discount of 10%. How much is the actual price of the car? 1,111,111.11 Baht
c) Peter earns $550 after a 10% increase. How much money did he earn before his increase? $500
d) If the price of a computer is $2400, but I only pay $2000 for it, what percentage discount did I get? 16.6%
b) I bought a car for 1 000 000 baht after a discount of 10%. How much is the actual price of the car? 1,111,111.11 Baht
c) Peter earns $550 after a 10% increase. How much money did he earn before his increase? $500
d) If the price of a computer is $2400, but I only pay $2000 for it, what percentage discount did I get? 16.6%
Review 4
Simplify the following
a) 5d - 3d = 2d
b) 3r + 7 - 2r - 9 = 1r -2
c) 10s + 6 - 6s -2 = 4s +4
a) 5d - 3d = 2d
b) 3r + 7 - 2r - 9 = 1r -2
c) 10s + 6 - 6s -2 = 4s +4
Review 5
1. The ratio of the number of boys to the number of girls in a school is 80:90 and the ratio for the number of teachers to the number of girls are 5:40.
a) Write a ratio for the number of boys to the number of girls to the number of teachers in the school. 3200 : 3600 : 450 or 320 : 360 : 45
b) Write this ratio in its simplest form. 64 : 72 : 9
c) If there are 99 teachers in the school, how many people are there all together? 704 + 792 + 99 = 1595
2. If I have to be at school at 11 am on Saturday for the sports day, and I live 1 hour and 25 minutes away from school, what time do I have to leave my house to be at school on time? 9:35 am
a) Write a ratio for the number of boys to the number of girls to the number of teachers in the school. 3200 : 3600 : 450 or 320 : 360 : 45
b) Write this ratio in its simplest form. 64 : 72 : 9
c) If there are 99 teachers in the school, how many people are there all together? 704 + 792 + 99 = 1595
2. If I have to be at school at 11 am on Saturday for the sports day, and I live 1 hour and 25 minutes away from school, what time do I have to leave my house to be at school on time? 9:35 am
Review 6
Solve, if the value of x = 5
a) x + 7
= 5 + 7
= 12
b) 2x
= 2(5)
= 10
c) 3x + 3
= 3(5) + 3
= 15 + 3
= 18
d) x / 1
= 5 / 1
= 5
a) x + 7
= 5 + 7
= 12
b) 2x
= 2(5)
= 10
c) 3x + 3
= 3(5) + 3
= 15 + 3
= 18
d) x / 1
= 5 / 1
= 5
Review 7(Direct Proportion)
a) Draw a rectangle with a length of 10 cm and a breadth of 7 cm.
b) If I want to redraw the same rectangle, but with a breadth of 21 cm, how long should the length be? 30 cm
b) If I want to redraw the same rectangle, but with a breadth of 21 cm, how long should the length be? 30 cm
Review 8
Simplify
a) 5w - 8 - 2w + 5 3w - 3
b) 10t + 2x - 10 - 6 10t + 2x - 16
c) 100 - x + 2x - 57 43 + x
a) 5w - 8 - 2w + 5 3w - 3
b) 10t + 2x - 10 - 6 10t + 2x - 16
c) 100 - x + 2x - 57 43 + x
Review 9
a) 30% of $210 is $63
b) If John has 420 Asian stamps in his collection and he has 70% stamps that are Asian, how many stamps does he have in total? 600 stamps
c) If there are 55% girls and 43% boys in a school, what percentage are teachers and staff? 2%
d) In a sale I got 25% discount for shoes that cost $36. (i) How much was the discount? $9 (ii) How much did I pay for the shirt? $36 - $9 = $27
e) In Singapore I paid $20 for a book and the GST was 5%, how much did I pay in total? $21 (Because GST is excluded from the price)
f) When my baby sister was 5 years old she weighed 18kg. On her 10th birthday she weighed 24kg. What percentage weight did she gain over the time period? She is 33.3% heavier than when she was 5 years old.
b) If John has 420 Asian stamps in his collection and he has 70% stamps that are Asian, how many stamps does he have in total? 600 stamps
c) If there are 55% girls and 43% boys in a school, what percentage are teachers and staff? 2%
d) In a sale I got 25% discount for shoes that cost $36. (i) How much was the discount? $9 (ii) How much did I pay for the shirt? $36 - $9 = $27
e) In Singapore I paid $20 for a book and the GST was 5%, how much did I pay in total? $21 (Because GST is excluded from the price)
f) When my baby sister was 5 years old she weighed 18kg. On her 10th birthday she weighed 24kg. What percentage weight did she gain over the time period? She is 33.3% heavier than when she was 5 years old.
Review 10
In my car wash shop we can wash 2 cars at a time. Today I have 25 cars to wash. If it takes 15 minutes to wash 1 car, and I open my shop at 11 am, what is the earliest that I can close my shop? I can close my shop at 14:15 at the earliest.