maths-taster-activities.ppt

1. Maths
Simon Says Numbers
1) Going round the room, number yourself in sequence starting
from 10
2) I will call out a maths statement and an instruction
3) If your number follows the statement, follow the instruction
(e.g. I say – stand up if you are a multiple of 8;
… the numbers 16, 24 and 32 stand up)
4) You are eliminated when you get one wrong.
5) Last person left is the winner!

2. Maths
Fractions are a Piece of Cake
Algernon’s mum baked his favourite cake.
His dad ate 1/6 of the cake.
His brother ate 1/5 of what was left.
Then his sister had 1/4 of what was left.
After that his mum ate 1/3 of the remaining cake and the dog
ate half of what was left.
What fraction of the whole cake is left for Algernon to eat?
Solution: 1/6
Everyone ate the same amount - his brother ate 1/5 of 5/6,
his sister ate 1/4 of 4/6 etc.

3. Powers - The Power of Rodents
A local primary school had a hamster in every class.
Unfortunately, exactly a year ago two escaped.
They have been breeding under the school and the population
has doubled every six weeks.
How many are there now?
Solution: 256
52 / 6 = 8. 28 = 256
Maths

4. Percentages - Khallesi’s Tasty Cake
Khallesi is becoming famous for her Mexico Mud Cake.
Unfortunately 76.8% of the people who have tried it
so far didn’t like it – mainly because one of the main
ingredients is mud from Mexico.
Based on the percentage, at least how many people
must have tried it?
Solution: 125 people
Converting the percentage into a gives 768/1000.
Reducing this to the lowest terms, 768/1000 = 96/125.
The denominator is the minimum number required to get the answer.
Maths

5. Algebra - One Great Leap…
Dennis rushes to school at an average speed of 6 km/h, to make
sure he is not late. On the way home, for a dare, he hops all the
way, and achieves an impressive average speed of 4 km/h.
What is his average speed for the journey there and back?
Solution: 4.8 km/h.
If the distance to school is d, then the total time for the
journey t=d/6+d/4 = 5d/12. Rearranging d = 2.4t.
The total distance of the journey is 2d, so the equation for the
average speed is: 2d/t. Substituting in the value for d, the
average speed = 2 x 2.4 t/t (where t cancels out) = 4.8 km/h.
Maths