Maths Grade 8

Revision One

Estimation and approximation

Recall that

A. Estimation is done roughly

1. We use rounded off valies
2. We use units to estimate

B. Approximation is done by rounding off to the nearest
    1.  10, 100, 1000
     2. To the nearest significant figure
     3. To the nearest decimal place

Please refer to your notes on this topic for more steps
Please solve the following


Assignment 1
Revision test 8 pg 58 new general mathematics
Number 1 - 10
Please solve in your maths note book and note it as assignment 1

Corrections 

question 7

there are 334 pages

there are 460 words per or for one page

therefore 

334 ✕ 460= 153640 words in the book

Question 8

60 min = 1 hour

24 hour = 1 day

365 days = 1 year 

therefore 

60 ✕ 24 ✕ 365 ✕ 14 = 7358400 min for one person 

for both friends 7358400 ✕ 2 =14716800 min

Question 9

one pace = 82cm

he walked a total of 6854 paces 

therefore 

Total distance between villages = 82 ✕ 6854 

=562028 cm

but the question required the answer to be in kilometer "estimate in km...."

there fore convert 562028cm to kilometer 

100cm = 1m

1000 meter = 1 km

100,000cm = 1km

Therefore

562028 ÷ 100,000 = 5.62028km
Total distance between villages in kilometre is 5.62028km

Question 10

1 bucket = 8.8 litres 

1 tank = 10,000kl

Total number of bucket drawn per week from the tank = 848 buckets

total number of kilolitres left = ?

1. find the number of buckets in litres i.e. 8.8 ✕ 848 =7462.4litres
2. convert 7462.4litres to kilolitres i.e. since 1000 litre is 1 kilolitres therefore 7462.4 ÷ 1000 = 7.4624kilolitres 
3. subtract 7.4624kilolitres from the total quantity of water in the tank i.e. 10,000 - 7.4624 = 9992.5376 kilolitres.

Note:    

• solve number 1 - 6
• copy this as corrections 
• proceed to the next revison exercise 
• expect the next exercise next monday 

Revision Two

Algebraic Expression 1

Remember all we have done in algebraic expression one from

1. directed algebraic terms to 
2. substitution to 
3. removing of brackets to 
4. expanding algebraic expressions.

Please refer to your notes for ways of solving problems under each heading and 

Solve revision test 7 page 52 new general mathematics

Number 1 - 10

Refer to this as assignment 2

Assingment 1 (week one)
Estimation and approximations
Revision test 8. Number 1 - 10
New General Mathematics Page 58


Assignment 2 (week two)
Revision test 7 number 1 - 10
New General Mathematics page 52

Assignment 3 week three
Revision test 11 numbers 1 - 10
NGM page 90

Assgment 4 most recent
Ex 12c : NUMBER  1, 2, 3, 4, 6
If they have watched the video repeatedly not less than 3 times They are to
1. Copy nots from the graph by pausing when it's clear
2. Solve ex 12c number 1, 2, 3, 4 and 6
     - write out the coordinate of the points

     - write out the scale used in each of the graph exercise