## Posts Tagged ‘challenge’

## 5. It’s Too Hard

September 29, 2017## 7c. Crack a Security Code for Middle School………… Yes! Really!

August 27, 2017**NB: This post has been updated twice. Disraeli said that if you want to become acquainted with a subject, write about it!!!! Mathspig’s head nearly exploded writing about this subject. But I’ve got it down to its simplest form now. One that Mathspig finally understands.**

**The Complaint**: Maths is really SCARY!…………….

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**The Cause**:

#### Some students think maths is always right or wrong and they are scared of making mistakes.

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**The Solution:**

#### Tackle problems that can’t be solved even by a computer. Students can only guess the answer and then test it. Anyone can make a guess. Work in groups. Every member of the group can contribute as students explore this maths.

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## The Challenge:……………………………………………………….

## Can you crack a security encryption code?….**…****………………………………………………..**

**……………………..…………………….……………………………………………………………**

**Topics:**

**Prime Numbers, Really BIG numbers……………………..**

**…………………………………………………………………………**

**Prime Numbers Hide Your Secrets: SLATE**

Remember the best online calculator is the **WEB 2.0 Calc.** NOTE: This is a secure website and you can check on its KEYCHAIN too.

You will find a fantastic list of Prime Numbers **here**.

**Crack a Security Code WORKSHEET & ANS**

Mathspig thanks Prof Kate Smith-Miles, Prof of Applied Maths, Monash University for the information about Keychains. Kate has used KEYCHAIN exercises with primary school students. They really enjoyed going home and showing their parents how to find a Keychain on the computer.

## 8. When will I EVER use this maths?

August 19, 2017**The Complaint**: I’ll Never Use This Maths!………………

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**The Cause**:

#### Text book exercises that are good for skill building, but appear irrelevant to the real world.

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**The Solution:**

### You are going to use this maths NOW

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### 8a. Calculate Your Daily Iron Intake

### 8b. How much blood can YOU lose and survive?

## …METRIC………………………………………………………………..

## ……USA Units………………………………………………………..

### 8c. What Volume of Alcohol is Lethal?

## 8a. Calculate Your Daily Iron Intake

August 19, 2017# The Complaint

## 8a: When will I EVER use this maths?

# The Cause:

#### Students doing repetitive text book exercises without using maths to solve REAL WORLD problems.

**The Solution:**

## You are going to use this maths NOW.

# Calculate Your Daily Iron Intake

# TOPICS: Decimals, %, weight units (METRIC)

Some information you need.

Iron (Chemical symbol:Fe) content in food is recorded in mg because there are only small amounts of iron in food.

1 g = 1000 mg

eg. 1 paper clip = 0.5 g = 500 mg

Iron in 2 teaspoon peanut butter = 0.19 mg

**Full Page Worksheet PDF:Daily Iron Intake Calculation Work Sheet**

# WORKED EXAMPLE: Breakfast

**More info here**

## 8b. How much blood can YOU lose and survive? ……………METRIC

August 16, 2017# The Complaint

## 8b: When will I EVER use this maths?

# The Cause:

#### Students doing repetitive text book exercises without using maths to solve REAL WORLD problems.

**The Solution:**

## You are going to use this maths NOW…………………..

## ……………………………………………………………………………….

## How much blood can YOU lose and survive?

## ………….METRIC UNITS

Remember the best calculator to use is the **WEB 2.0 Calculator** as it shows the worked equation as you go.

**CAREERS:** It’s not only health workers who need to understand these calculations, but also creatives running health campaigns online, on TV, radio and in magazines.

# TOPICS: Decimals, %, algebra, vol, weight units (METRIC)

PDF WORKSHEET HERE:**How**** much blood can you lose and still survive? WORKSHEET METRIC**

## 8b. How much blood can YOU lose and survive? ……………USA Units

August 16, 2017# The Complaint

## 8b: When will I EVER use this maths?

# The Cause:

#### Students doing repetitive text book exercises without using maths to solve REAL WORLD problems.

**The Solution:**

## You are going to use this maths NOW…………………..

## ……………………………………………………………………………….

## How much blood can YOU lose and survive?

## ………….USA Units

Remember the best calculator to use is the **WEB 2.0 Calculator** as it shows the worked equation as you go.

**CAREERS:** It’s not only health workers who need to understand these calculations, but also creatives running health campaigns online, on TV, radio and in magazines.

# TOPICS: Decimals, %, algebra, vol, weight units (USA UNITS)

PDF WORKSHEET HERE:How much blood can you lose and still survive? WORKSHEET USA UNITS

## 8c. What Volume of Alcohol is Lethal?

August 14, 2017# The Complaint

## 8c: I Will Never Use this Maths

**The Solution:**

## You are going to use this maths NOW……………..

……………………………………………………………………..

# How much alcohol will kill you?

## TOPICS: Decimals, %, algebra, vol, weight units (Metric)

At low levels of consumption alcohol impairs decision making and inhibits coordination. It makes you DUMB and CLUMSY, which can cause serious injuries if you, say, fall down stairs.

Legal Age to Buy or Sell Alcohol USA: 21 years

Legal Age to Buy or sell Alcohol AUST, NZ & UK: 18 Years

Legal Age to Buy or sell Alcohol CANADA: 18 – 19 Years depending on region.

At higher levels of consumption ALCOHOL can kill. It is a depressant. It acts on your central nervous system. It can STOP YOU BREATHING.

WORKSHEET PDF: ** How Much Alcohol Would Kill You? WORKSHEET**

**WORKED EXAMPLE**

**1. Calculate the weight of (pure) alcohol or ethanol in the following standard drinks using the following information:**

Now Ethanol = **0.79** gm/ml

More information @ **alcohol.org.nz**