# MathArguments180.com

180 Days of Ideas for Discussion in Math Class. (as of 9July2014, we're in overtime!)

## Wednesday, October 1, 2014

### 267: Date puzzle

The day before yesterday Edward was 17. Next year he will be 20. How can that be the case?

## Tuesday, September 30, 2014

### 266: Lending $50

If I were to give you $50 we'd have the same amount. If you were to give me $50 I'd have 9 times as much as you. How much do we each have?

Source.

## Sunday, September 28, 2014

### 265: Nix The Tricks

- Which of the following "tricks" was helpful to you in learning and understanding what was going on?
- Which ones just got you confused when the problem changed form slightly?
- Did you ever confuse $\dfrac{3}{5}x\dfrac{1}{5}$ with $\dfrac{3}{5} = \dfrac{x}{5}$ with $\dfrac{3}{5} + \dfrac{1}{4}$?

Which "tricks" should teachers stop using?

### 264: Add Operators

Using only the symbols +, -, *, and ÷ as replacement for the blanks, find the greatest value of the expression given.

What would be the greatest value if you could also use parentheses?

How do you know this is the largest value?

source: Algebra Problems, Dale Seymour.

1 ___ 2 ___ 3 ___ 4 ___ 5 ___ 6 ___ 7 ___ 8

What would be the greatest value if you could also use parentheses?

How do you know this is the largest value?

source: Algebra Problems, Dale Seymour.

## Saturday, September 27, 2014

### 263: Make Equal with Parentheses

Insert parentheses into each of the following expressions so that each will have the same value.

Algebra Problems, Dale Seymour.

4 + 3 * 7 - 4

2 * 3 + 3 * 5

2 * 5 - ½ * 10 * 9

3² ÷ ⅓ + 3 * 6

Algebra Problems, Dale Seymour.

## Friday, September 26, 2014

## Thursday, September 25, 2014

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