## Welcome to H3 Maths

Blog Support for Growing Mathematicians

## Posts tagged with Excel

### Excel basics for Math students

July29

In this series of short videos students will learn to make use of the basic mathematical features of Microsoft Excel, such as using Excel as a calculator, using functions, etc. Many high school Math students struggle to learn the basics of Excel, yet to do so can greatly enhance their skills and also provide useful […]

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### Less than excellent use of Excel…

July27

Yes, it happened to me – I was using Excel to finish my tax claim and then sent it off to my accountant. He remarked to me, over lunch, that I had made a mistake in my Excel calculations. Yes, I had made the kind of error that is just so easy to do – […]

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### Iditarod Activity Sheet for Middle School

February28

I have included an activity sheet for Year 8 or 9 students to help them take a mathematical interest in the Iditarod Race, and also use Excel to sort and graph the mushers. Click on or download Using the Iditarod Race as a Teaching Tool in Mathematics.

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### Excel fails at some math calcs!

August1

In a blog post, Microsoft employee David Gainer said that when computer users tried to get Excel 2007 to multiply some pairs of numbers and the result was 65,535, Excel would incorrectly display 100,000 as the answer. Gainer said Excel makes mistakes multiplying 77.1 by 850, 10.2 by 6,425 and 20.4 by 3,212.5, but the […]

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#### Post Support

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)?]