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Posts tagged with integers

Numbers Matter

June13

Novak Djokovic started to realize what he had just achieved. This was the moment he won grand slam number 23, surpassing Rafael Nadal at the top of the men’s all-time list. In a golden era for the sport – stretching back to Roger Federer’s first grand slam title 20 years ago – Djokovic has now eclipsed those […]

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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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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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Zero Has a New Hero

November16

London (2017): An ancient Indian manuscript, dating back to the third century, has revealed the oldest recorded use of ‘zero’ – pushing back one of the greatest breakthroughs in the history of mathematics back by over 500 years, Oxford scientists say. Bakhshali manuscript was found in 1881, buried in a field in what was then […]

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Numbers are Vital – Here’s the Proof

April2

I love the “cover-up method” where I hide something and students are challenged to find the answer. For example, suggest some numbers that would make this new item make sense. Then check out the solutions in ‘Post Support’.

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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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A billion trees? Let’s break that down to human levels

November24

In a recent news item a comment was made about reaching a tree-planting target of 1 billion – “With the right incentives and the right conditions, one person could comfortably plant 400,000 trees in a year. So you would need just 250 people planting that amount every year for a decade (10 years) to reach […]

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Let’s get two negative about Integers!

November14

A fun skit (source unknown) to help you understand that two negatives together = a positive answer…

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The 10958 Problem or Fun with Integers

October26

The 10,958 Problem from NumberPhile

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Another puzzle moment

May23

This puzzle is divided into quarters. Each quarter uses two missing numbers plus the 3 in the center to add to the number in the middle. For example, add the missing numbers at 12 o’clock, 3 o’clock and the 3 to = 10. There are several combinations and this puzzle first appeared as a Year […]

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« Older Entries

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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