Concept of Ratio

We have all learned about ratio in Primary 5 and 6, so we will just give you a quick recap on what is ratio.

In general, a ratio of 2:3 means that the amount of the first ratio is two thirds of the amount of the total quantity. For example, if the first ratio refers to the amount of tables and the second ratio is the number of chairs. It would mean that there are more chairs than tables in the classroom.

Ratios can be easily converted into fractions and percentage. Using the same example, the number of tables is 2/5 of the total number of furniture. The chairs would be 60% of the total amount of stuff.

Question for this Topic:
I have 516 pieces of coloured paper in a plastic bag. They are in 3 different colours, red, yellow and blue, but are not equal in number. The number of red paper is twice the number of blue paper. The yellow paper is 3 times the number of blue paper.
What is the number of

(a) Red paper?
(b) Yellow paper?
(c) Blue paper?

Answer this question in the comments section.

Concept of Speed

Speed is the rate of motion or how fast something moves. It's symbol can be kmph, km/h, or mph

It is calculated simply with the formula Distance x Time. For example, if a van travelled 35km in half an hour, it's travelling speed is 70 km/h.

Speed can likewise be used to find a certain distance or time. For example, if a fighter jet used on national day flew for 12 minutes at 2000km/h across Singapore, the distance it flew is 12/60*2000km which is 1/5*2000km which is 400km!

This is just about what speed is about.

Introduction

Hi everyone,

Welcome to our Math blog!!! Feel free to participate as much as you want and learn all you want to know. You can also drop your comments in the chat box. Most importantly, have fun!

(Sorry for not posting this post earlier.)

Signing off,

Alloy

Kieran

Jiankai