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Blog Support for Growing Mathematicians

Posts tagged with number

Someone Who Enjoys Difficult Problems!

May5

You are faced with a difficult problem, it is not easily solved. How do you feel? Well, if you are Avi Wigderson, one of the winners of the 2021 Abel Prize, you are very happy! Difficult problems have given him a lifelong feast of mathematics to enjoy. Wigderson has spent his life working on understanding […]

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How many tabs should you have open at once?

January12

What is the ideal number of tabs you should have open at the same time on your device? (see Post Support for the answer): A quick survey of The Spinoff office revealed that people had an average of 18 tabs open, though a few acknowledged that because it was a Monday morning, they had fewer […]

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Great Balls of (not) Fire, but rather Asteroids!

October25

An impressive comparison of asteroid sizes, in relation to New York City. See the full clip here More interesting asteroid analysis (including a spinning asteroid movie) for rock-hounds can be found here.

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Milestone Pageviews on H3

October7

Every once in a while a number becomes a milestone; a place-marker or signpost of significance – just like your 16th birthday or turning 21. Today, H3 views reached 20,000 which, given the sporadic posts from a busy blogger, is rather special. Is this the total page views? No. H3 was begun to starve off […]

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How long to Drive to the Sun?

October7

How long would it take to drive to the sun? Longer than you think. The distance from the Sun to the Earth is around 93 million miles. Theoretically, If a person drove a car (with an unlimited amount of fuel) at a speed of 93 miles an hour (about 150 km/hr), then it would take […]

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Scratching heads with 7 year old’s math homework

October3

A mother has turned to social media asking for help with her 7-year-old son’s math homework after it left her completely “baffled”. It also stumped another parent with a maths PhD. So, how do you approach this rather complex looking problem? Here’s one way” What is the total value of the counters? (Answer in post support) […]

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Which is Greater – No of Stars or Grains of Sand?

September10

Grains of sand or stars – which is the bigger number? Obviously, grains and stars can’t be counted, not literally. But you can guestimate. Science writer David Blatner, in his new book Spectrums, says a group of researchers at the University of Hawaii, being well-versed in all things beachy, tried to calculate the number of […]

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A 13yr old Girl Uses Math to Help Win The Battle of Britain

July16

A follow up video that gives some idea of the practical outcome of Hazel Hill’s work can be found here.

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How Big is a Trillion?

January15

Wow, I just read in the news today that the world has amassed a debt level of just over 250 trillion dollars! But, just how big is a trillion? A trillion is a million million, or 1,000,000 with 6 more zeros, or 1,000,000,000,000. This video puts that huge amount into perspective (click on the picture […]

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Be a Number Wizz with Scott Flansburg

October24

Where did we get our number system from? Watch Scott Flansburg amaze with his addition skills and be equally transformed as he explains that our number system is based on angles. Yes, Trigonometry is the foundation of Number, or is Number the foundation of Trigonometry? Are you getting confused? Find out more in this video, […]

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Post Support

Largest number between o and 1 million which does not contain the ‘n’ is 88

 

Rotation SAT Problem: Answer: 4 (see: https://www.youtube.com/watch?v=FUHkTs-Ipfg)

 

Which number has its letters in alphabetical order? Answer: F O R T Y

Hidden Rabbit? Clue: check the trees

How long for the stadium to fill? 45 minutes.

Where are you? the North Pole

Prize Object Puzzle: If Sue does not know where the prize is in the first question, it can’t be under the square. She must have been told it is under another shape. Apply this same logic to Colin. It is then obvious that the prize cannot be under a yellow object. That helps Sue eliminate her yellow shapes. Got the idea?

Algebra Puzzle: Answer = 1

Popular Math Problems Answers: 1, 1

Number of tabs? According to Lifehacker, the ideal number of tabs you should have open is nine. Yes, a single digit. To some, this is like playing a piano and only using a fraction of the notes!

Worst Graph? Where to start. What a visual mess and even some of the lines merge and are impossible to follow. A graph is a visual display of data, with the goal to identify trends or patterns. This is a spider’s web of information which fails to show a clear pattern at all. Solution? Well, different colors would help, or why not group in two or three graphs where trends are similar?

Number of different nets to make a cube is eleven – see this link

Homework Puzzle; The total value of the counters is 486, so halve this to get 243. Now, arrange the counters to equal this amount twice.

The graph on the left (Coronavirus) is for a time period of 30 days, while the one on the right (SARS) is for 8 months! Very poor graphical comparison and hardly relevant, unless it is attempting to downplay the seriousness of the coronavirus?

10 x 9 x 8 + (7 + 6) x 5 x 4 x (3 + 2) x 1 = 2020

NCEA Level 2 Algebra Problem. Using the information given, the shaded area = 9, that is:
y(y-8) = 9 –> y.y – 8y – 9 =0
–> (y-9)(y+1) = 0, therefore y = 9 (can’t have a distance of – 1 for the other solution for y)
Using the top and bottom of the rectangle,
x = (y-8)(y+2) = (9-8)(9+2) = 11
but, the left side = (x-4) = 11-4 = 7, but rhs = y+? = 9+?, which is greater than the value of the opp. side??
[I think that the left had side was a mistake and should have read (x+4)?]

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