คำศัพท์คณิตศาสตร์
TOPIC Addition,place value
Activity : Decoding
Each letter stands for a digit between 0 and 9.Find the value of each letter in the sums shown.
TOPIC Forming and solving equations
Activity : Find the number
1. Find two whole number which multiply together to make 221.
2. Find two whole number which multiply together to make 41.
3. I am half as old as my mother was 20 years ago. She is now 38.How old am I?
4. Find two numbers whose sum is 20 and the sum of their squares is 208.
5. Find two numbers whose sum is 10 and the sum of their cubes is 370.
6. Find the number which gives the same result when it is added to 3-3/4 as when it is multiplied by 3-3/4.
TOPIC Percentages
Activity : Percentage problems
1. An amount increases by 20 %. by what percentage do I have to decrease the new amount in order the get back to the original amount?
2.The length of rectangle increases by 20% and the width decreases by 20%, what is the percentage change in the area?
3. the volume of cube A is 20% more than the volume of cube B. what is the ratio of the cube A's surface area?
TOPIC Probability
Activity : Probability problems
-To calculate the theoretical probability of and event,you need to list all the possible outcomes of the experiment.