Download presentation

Presentation is loading. Please wait.

1
**The Game of Algebra Prelude to Signed Numbers**

Lesson 3 by Herbert I. Gross & Richard A. Medeiros © Herbert I. Gross next

2
**numbers more meaningful and**

In a preceding course, “Math as a Second Language”, we emphasized that most of us visualize numbers as adjectives rather than as nouns. This prelude to signed numbers reviews this concept. Understanding this presentation will make the subsequent study of signed numbers more meaningful and easier to visualize. next © Herbert I. Gross

3
**1 2 3 5 7 4 6 8 9 Adjective Adjective Noun Noun next**

9 Adjective Adjective Noun Noun next © Herbert I. Gross

4
**Numbers can be viewed either as nouns or adjectives.**

next © Herbert I. Gross

5
**In this case, 2 is a noun that names the point P.**

1 2 3 In this case, 2 is a noun that names the point P. next next next © Herbert I. Gross

6
2 Q P 1 2 3 In this case, 2 is an adjective that modifies (measures) the distance between points Q and P. next next next © Herbert I. Gross

7
**as adjectives. That is, we’ve seen:**

Most of us see numbers as adjectives. That is, we’ve seen: 3 people 1 2 3 3 apples 1 2 3 3 tally marks 1 2 3 next next next next © Herbert I. Gross

8
**But never “threeness” by itself.**

next © Herbert I. Gross

9
**Let’s explore this Adjective / Noun theme.**

next © Herbert I. Gross

10
True or False. 1 = 1 next © Herbert I. Gross

11
**True or False. 1 = 1 True or False. 1inch = 1mile**

1 = 1 True or False. False 1inch = 1mile next next next © Herbert I. Gross

12
**1. The adjective (in this case the number 1).**

An amount such as 1 mile is called a quantity. A quantity such as 1 mile consists of 2 parts. 1. The adjective (in this case the number 1). 2. The noun (in this case “mile” which is referred to as the “unit”). next next next © Herbert I. Gross

13
When the nouns (units) are not present, and we write 1 = 1, we are assuming both 1’s modify the same noun. next © Herbert I. Gross

14
**First Fundamental Principle**

Language of Math When we write a = b we assume that a and b modify the same noun (units are the same). next next © Herbert I. Gross

15
True or False. 3 +2 40 next © Herbert I. Gross

16
**True or False. 3 dimes + 2 nickels 40 cents**

next next © Herbert I. Gross

17
**If the nouns do not appear, and we write 3 + 2 = 5, we are assuming **

3, 2, and 5 modify the same unit (noun). next © Herbert I. Gross

18
**When we write a + b = c we are assuming that a, b, and c modify the **

Second Fundamental Principle Language of Math When we write a + b = c we are assuming that a, b, and c modify the same noun (unit). next next © Herbert I. Gross

19
**3 + 2 = 5 3 apples + 2 apples = ? 5 apples**

when the adjectives modify the same noun. 3 apples + 2 apples = ? 5 apples next next © Herbert I. Gross

20
**1 + 2 = 3 1 cookie + 2 cookies = ? 3 cookies**

when the adjectives modify the same noun. 1 cookie + 2 cookies = ? 3 cookies next next © Herbert I. Gross

21
**4 + 2 = 6 4 gloogs + 2 gloogs = 6 gloogs**

when the adjectives modify the same noun. For example, we do not have to know what “gloog” means to be able to say … 4 gloogs + 2 gloogs = 6 gloogs next next © Herbert I. Gross

22
4 + 2 = 6 when the adjectives modify the same noun. 4x + 2x = ? x x x x x x In a similar way with respect to algebra, we do not need to know what number x represents to know that 4 of them plus 2 more of them equals 6 of them. 6x next next next next © Herbert I. Gross

23
**True or False. False × 30 20 = 600 3 tens × 2 tens = 6 tens**

600 = 6 hundred Not 6 tens next next next next next © Herbert I. Gross

24
**True or False. True = 6 × “ten tens” 6 “ten tens” “ten tens” = hundred**

3 tens × 2 tens = 6 “ten tens” 6 × “ten tens” = 6 “ten tens” “ten tens” = hundred 6 “ten tens” = 6 hundred next next next next next next next © Herbert I. Gross

25
When we multiply two quantities, we separately multiply the numbers (adjectives) to get the adjective part of the product, and we separately multiply the two units (nouns) to get the noun part of the product. When we multiply two nouns we simply write them side-by-side. next © Herbert I. Gross

26
**Examples 1. 3kw × 2 hrs = 6kw hrs 2. 4ft × 2 ft = 8ft ft = 8 ft²**

(measuring electricity) 2. 4ft × 2 ft = 8ft ft = 8 ft² (measuring area) 3. 5ft × 2 lbs = 10ft lbs (measuring work) next next next © Herbert I. Gross

27
**Language of Math If a and b are adjectives and x and y are nouns, then**

Third Fundamental Principle Language of Math If a and b are adjectives and x and y are nouns, then (ax) × (by) = (ab) × (xy). next next © Herbert I. Gross

28
**Example 3 hundred x 2 thousand = 6 × hundred thousand =**

next next next next next © Herbert I. Gross

29
**Compare with the following traditional recipe.**

300 × 2,000 = 6 , 1) Multiply the non zero digits. 2) Annex the total number of zeros. next next next next next © Herbert I. Gross

30
**Summary Most of us see numbers concretely in the form of quantities.**

A quantity is a phrase consisting of a number (the adjective) and the unit (the noun). For example, we don’t talk about a weight being 3. Rather we say 3 ounces, 3 grams, 3 tons, etc. next next next next © Herbert I. Gross

31
**In this context, our course will be based on the following three principles.**

next © Herbert I. Gross

32
**When we say two numbers (adjectives) are equal, we assume they are modifying the same unit (noun).**

First Principle For example, 3 ounces is not equal to 3 pounds because an ounce does not equal a pound, even though 3 means the same thing in each case. next next next © Herbert I. Gross

33
**When we say a + b = c, we will assume that a, b, and c modify the same unit (noun).**

Second Principle For example, we don’t write = 379 even though year + 2 weeks = 379 days (Except in a leap year.) next next next © Herbert I. Gross

34
When we multiply 2 quantities we separately multiply the adjectives, and we separately multiply the units (nouns). Third Principle For example: hundred × 2 million = 6 hundred million (Notice how much simpler this might seem to a beginning student than if we had written 300 × 2,000,000 = 600,000,000). next next next © Herbert I. Gross

Similar presentations

OK

The Game of Algebra or The Other Side of Arithmetic The Game of Algebra or The Other Side of Arithmetic © 2007 Herbert I. Gross by Herbert I. Gross & Richard.

The Game of Algebra or The Other Side of Arithmetic The Game of Algebra or The Other Side of Arithmetic © 2007 Herbert I. Gross by Herbert I. Gross & Richard.

© 2017 SlidePlayer.com Inc.

All rights reserved.

Ads by Google

Ppt on hong kong tourism Ppt on world book day dress Ppt on classroom action research Ppt on going places Ppt on indian politics powerpoint Ppt on conference call etiquette images Ppt on next generation 2-stroke engine pistons Ppt on glorious past of india Ppt on environment and development Ppt on uninterrupted power supply