Other tags that relate to Speedy Sidney
STEM - living world. Time. Ratio and proportion. Maths Supporting SET. Length/distance. STEM - physical world. Physics. Estimating and approximating. Speed and acceleration. Mathematical modelling.There are 72 results
Broad Topics > Fractions, Decimals, Percentages, Ratio and Proportion > Ratio and proportion
Triathlon and Fitness
Age 11 to 14
Challenge Level
The triathlon is a physically gruelling challenge. Can you work out which athlete burnt the most calories?
Rule of Three
Age 11 to 14
Challenge Level
If it takes four men one day to build a wall, how long does it take 60,000 men to build a similar wall?
Toad in the Hole
Age 11 to 14
Challenge Level
Is it cheaper to cook a meal from scratch or to buy a ready meal? What difference does the number of people you're cooking for make?
Investigating the Dilution Series
Age 14 to 16
Challenge Level
Which dilutions can you make using only 10ml pipettes?
Ratios and Dilutions
Age 14 to 16
Challenge Level
Scientists often require solutions which are diluted to a particular concentration. In this problem, you can explore the mathematics of simple dilutions
Dilution Series Calculator
Age 14 to 16
Challenge Level
Which dilutions can you make using 10ml pipettes and 100ml measuring cylinders?
Exact Dilutions
Age 14 to 16
Challenge Level
Which exact dilution ratios can you make using only 2 dilutions?
Nutrition and Cycling
Age 14 to 16
Challenge Level
Andy wants to cycle from Land's End to John o'Groats. Will he be able to eat enough to keep him going?
Bus Stop
Age 14 to 16
Challenge Level
Two buses leave at the same time from two towns Shipton and Veston on the same long road, travelling towards each other. At each mile along the road are milestones. The buses' speeds are constant. . . .
Temperature
Age 11 to 14
Challenge Level
Is there a temperature at which Celsius and Fahrenheit readings are the same?
The Fastest Cyclist
Age 14 to 16
Challenge Level
Andy is desperate to reach John o'Groats first. Can you devise a winning race plan?
Circuit Training
Age 14 to 16
Challenge Level
Mike and Monisha meet at the race track, which is 400m round. Just to make a point, Mike runs anticlockwise whilst Monisha runs clockwise. Where will they meet on their way around and will they ever. . . .
Straw Scaffold
Age 11 to 14
Challenge Level
Build a scaffold out of drinking-straws to support a cup of water
Washing Elephants
Age 11 to 14 Short
Challenge Level
How long will it take Mary and Nigel to wash an elephant if they work together?
A Scale for the Solar System
Age 14 to 16
Challenge Level
The Earth is further from the Sun than Venus, but how much further? Twice as far? Ten times?
Mixed up Mixture
Age 14 to 16
Challenge Level
Can you fill in the mixed up numbers in this dilution calculation?
Speeding Boats
Age 14 to 16
Challenge Level
Two boats travel up and down a lake. Can you picture where they will cross if you know how fast each boat is travelling?
Burning Down
Age 14 to 16
Challenge Level
One night two candles were lit. Can you work out how long each candle was originally?
Hello Again
Age 11 to 14
Challenge Level
Anne completes a circuit around a circular track in 40 seconds. Brenda runs in the opposite direction and meets Anne every 15 seconds. How long does it take Brenda to run around the track?
Ratio or Proportion?
Age 7 to 14
An article for teachers which discusses the differences between ratio and proportion, and invites readers to contribute their own thoughts.
Eight Ratios
Age 14 to 16
Challenge Level
Two perpendicular lines lie across each other and the end points are joined to form a quadrilateral. Eight ratios are defined, three are given but five need to be found.
Tray Bake
Age 11 to 14
Challenge Level
My recipe is for 12 cakes - how do I change it if I want to make a different number of cakes?
Pythagoras’ Comma
Age 14 to 16
Challenge Level
Using an understanding that 1:2 and 2:3 were good ratios, start with a length and keep reducing it to 2/3 of itself. Each time that took the length under 1/2 they doubled it to get back within range.
Six Notes All Nice Ratios
Age 14 to 16
Challenge Level
The Pythagoreans noticed that nice simple ratios of string length made nice sounds together.
Slippage
Age 14 to 16
Challenge Level
A ladder 3m long rests against a wall with one end a short distance from its base. Between the wall and the base of a ladder is a garden storage box 1m tall and 1m high. What is the maximum distance. . . .
Cereal Mix
Age 11 to 14
Challenge Level
A farmer is supplying a mix of seeds, nuts and dried apricots to a manufacturer of crunchy cereal bars. What combination of ingredients costing £5 per kg could he supply?
Tin Tight
Age 14 to 16
Challenge Level
What's the most efficient proportion for a 1 litre tin of paint?
Fractions Rectangle
Age 11 to 14
Challenge Level
The large rectangle is divided into a series of smaller quadrilaterals and triangles. Can you untangle what fractional part is represented by each of the ten numbered shapes?
Oh for the Mathematics of Yesteryear
Age 11 to 14
Challenge Level
A garrison of 600 men has just enough bread ... but, with the news that the enemy was planning an attack... How many ounces of bread a day must each man in the garrison be allowed, to hold out 45. . . .
Do Unto Caesar
Age 11 to 14
Challenge Level
At the beginning of the night three poker players; Alan, Bernie and Craig had money in the ratios 7 : 6 : 5. At the end of the night the ratio was 6 : 5 : 4. One of them won $1 200. What were the. . . .
Around and Back
Age 14 to 16
Challenge Level
A cyclist and a runner start off simultaneously around a race track each going at a constant speed. The cyclist goes all the way around and then catches up with the runner. He then instantly turns. . . .
A Chance to Win?
Age 11 to 14
Challenge Level
Imagine you were given the chance to win some money... and imagine you had nothing to lose...
Retiring to Paradise
Age 11 to 14
Challenge Level
When Charlie retires, he's looking forward to the quiet life, whereas Alison wants a busy and exciting retirement. Can you advise them on where they should go?
One and Three
Age 14 to 16
Challenge Level
Two motorboats travelling up and down a lake at constant speeds leave opposite ends A and B at the same instant, passing each other, for the first time 600 metres from A, and on their return, 400. . . .
Conical Bottle
Age 14 to 16
Challenge Level
A right circular cone is filled with liquid to a depth of half its vertical height. The cone is inverted. How high up the vertical height of the cone will the liquid rise?
Racing Odds
Age 11 to 14
Challenge Level
In a race the odds are: 2 to 1 against the rhinoceros winning and 3 to 2 against the hippopotamus winning. What are the odds against the elephant winning if the race is fair?
Zin Obelisk
Age 11 to 14
Challenge Level
In the ancient city of Atlantis a solid rectangular object called a Zin was built in honour of the goddess Tina. Your task is to determine on which day of the week the obelisk was completed.
Square Pegs
Age 11 to 14
Challenge Level
Which is a better fit, a square peg in a round hole or a round peg in a square hole?
From All Corners
Age 14 to 16
Challenge Level
Straight lines are drawn from each corner of a square to the mid points of the opposite sides. Express the area of the octagon that is formed at the centre as a fraction of the area of the square.
Golden Thoughts
Age 14 to 16
Challenge Level
Rectangle PQRS has X and Y on the edges. Triangles PQY, YRX and XSP have equal areas. Prove X and Y divide the sides of PQRS in the golden ratio.
Triangle in a Triangle
Age 14 to 16
Challenge Level
Can you work out the fraction of the original triangle that is covered by the inner triangle?
Orbiting Billiard Balls
Age 14 to 16
Challenge Level
What angle is needed for a ball to do a circuit of the billiard table and then pass through its original position?
Trapezium Four
Age 14 to 16
Challenge Level
The diagonals of a trapezium divide it into four parts. Can you create a trapezium where three of those parts are equal in area?
Pi, a Very Special Number
Age 7 to 14
Read all about the number pi and the mathematicians who have tried to find out its value as accurately as possible.
Gift of Gems
Age 14 to 16
Challenge Level
Four jewellers share their stock. Can you work out the relative values of their gems?
How Big?
Age 11 to 14
Challenge Level
If the sides of the triangle in the diagram are 3, 4 and 5, what is the area of the shaded square?
Points in Pairs
Age 14 to 16
Challenge Level
Move the point P to see how P' moves. Then use your insights to calculate a missing length.
NRICH is part of the family of activities in the Millennium Mathematics Project.