## Welcome to H3 Maths

Blog Support for Growing Mathematicians

## Posts tagged with number

### 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 […]

### 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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### Sagrada Familia holds Mathematical Mysteries

October24

Number Puzzles in the Magic Square on the spectacular Sagrada Familia: H3 was recently in Barcelona and captivated by the soaring delights on this magnificent cathedral-in-progress (it is hoped to finish the building by 2026). Outside, among the modern sculptures of biblical characters is a magic square. It has hidden meanings. For example, the numbers […]

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### Wow – that’s a heap of tweets!

March2

Six thousand tweets are sent every second, which corresponds to five hundred million tweets a day. Every sixty seconds, 510,000 comments are posted on Facebook. Add the 1.7 billion websites on the internet and the information exchanged on social media sites such as WhatsApp (one billion users a month), WeChat (697 million users a month), […]

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### And a bit of fun for a change …

February20

How many spare parking spaces are in this picture?see Post Support for answer

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### Each Number is Significant!

April12

Every number is significant, even small ones that seem insignificant! For example, I was talking with a parent recently who told me that if they give a dose of medicine to an animal and it is incorrectly measured by 2% then it will kill the animal. I must admit that I was quite stunned by […]

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### Can you solve the fruit puzzle?

February18

Read Post Support for some clues. Hint: not all bananas are created equal!

### Number Sense = Mathematical Skills?

June28

We were finishing up the school term with some last minute marking and writing of student reports. I was also lamenting the inability of many students to know the difference between perimeter, area and volume (more on this in H3 later). Despite a range of teaching techniques (some involving practical measuring of outdoor objects and […]

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#### Post Support

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)?]