## Welcome to H3 Maths

Blog Support for Growing Mathematicians

## Archive for April, 2019

### Do you want to host a visit by H3 Math?

April9

Your blog host, H3, is visiting locations in Italy, France, Singapore, and the USA (West Coast) in August and September, 2019. If you are interested in hosting a school or class visit, please contact H3 in the comment section. The visit could include a brief outline of engaging math activities, an overview of this blog, […]

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### Average is anything but

April4

A group of 5 students were comparing how much they earned over the weekend. Here are the results: Jed \$55 (mowing lawns) Sarah \$30 (pocket money) Squid (not his real name) \$0 (sad face) Ginger \$20 (thanks auntie) Tim \$225 (thanks eBay) Squid (he has always loved math) said, “Wow, the average earnings was \$66‘” […]

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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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#### 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)?]