## Welcome to H3 Maths

Blog Support for Growing Mathematicians

## Posts tagged with indices

### What do these faces have in common?

February20

A wide variety of faces, yet they all have something in common. What do you think it is? Answer: They are all fake images! How? See this intriguing video which uses an amazing new mathematical facial formula (algorithm). Click on the image to view (approx 6min):

by posted under Uncategorized | tagged under , , , , ,  |  Comments Off on What do these faces have in common?

### The Real Math Behind ‘The Simpsons’

February5

So, in relation to my last post, here is a puzzle that appeared in a Simpsons Episode – centered on baseball. Can you figure out the attendance at this game? For a complete explanation, check out this 12min video here.

by posted under Uncategorized | tagged under , , , , , , , , , , ,  |  Comments Off on The Real Math Behind ‘The Simpsons’

### Geometric Squaring for accuracy…

February25

Spot the error in this student’s working: You spotted it? Yes, it is obvious that this student has forgotten to do the last problem correctly and worked out 7 x 2 when they should have done 7 x 7 (source here). Perhaps it is better to think of “Squared Numbers” as geometric squares. After all, […]

by posted under Uncategorized | tagged under , , , , , ,  |  Comments Off on Geometric Squaring for accuracy…

### Powers of 10 to estimate large numbers

May11

Have you ever tried to guess a mindbender like: “How many piano tuners are there in Chicago?” Physicist Enrico Fermi was very good at problems like these — learn how he used the power of 10 to make amazingly fast estimations of big numbers in this short video (from TED-Ed).

by posted under Uncategorized | tagged under , , , , ,  |  Comments Off on Powers of 10 to estimate large numbers

#### 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)?]