# Study Guide for Math Final Exam

Decimals

1. Know the representations of decimals.

(a) Units, strips, and mats
(b) Base 10 blocks
(c) Dollars, dimes, and pennies

2. Be able to explain why and how we teach expanded exponential form.

3. Understand the difference between a terminating decimal and a repeating
decimal. Be able to convert these to fractions.

4. Know the definition of an irrational number.

5. Be able to add, subtract, multiply, and divide with decimals .

6. Understand how to write a number in scientific notation with a given
number of significant digits .

7. Be able to convert from fractions to decimals , fractions to percents,
decimals to percents, and vice versa.

8. Write and solve word problems involving ratios, including similar triangles
and compound interest problems. Be able to solve these in more
than one way.

9. Know how to order a set of decimals and/or fractions.

Sets

1. Be able to describe sets with word descriptions, listing in braces, and
set builder notation.

2. Be able to set up and solve problems with Venn diagrams.

Conceptual Models for Addition, Subtraction, Multiplication, and
Division

You will need to be able to identify each different model, be able to formulate
problems which illustrate each model, and be able to discuss benefits and
drawbacks.

1. Set Model

2. Measurement Model

3. Take-away

5. Comparison

6. Number- line (Measurement)

8. Array Model

9. Rectangular Area

10. Multiplication Tree

11. Cartesian Product

12. Repeated-Subtraction

13. Partition

14. Missing Factor

Algorithms
You will need to demonstrate a clear understanding of Exchange. You need
to understand how each step in the development of the algorithm works and
how they lead to the final algorithm.

• Units, Strips, and Mats
• Place- Value Cards
• Instructional Algorithm
• Final Algorithm

2. Subtraction Algorithm

• Units, Strips, and Mats
• Place-Value Cards
• Instructional Algorithm
• Final Algorithm

3. Multiplication Algorithm

• Units, Strips, and Mats
• Place-Value Cards
• Expanded Form
• Instructional Algorithm
• Final Algorithm

4. Division Algorithm

• Scaffold
• Standard Algorithm

Problem Solving Strategies
Know Polya’s Problem Solving Strategies. Given a problem, be able to tell
me which of the above strategies you used to solve the problem. Be able to
create and solve a problem using a particular strategy I give you.

1. Guess and Check

2. Make an orderly list

3. Draw a Diagram

4. Look for a Pattern

5. Make a Table

6. Use a Variable

7. Consider Special Cases

8. Solve an Equivalent Problem

9. Solve an Easier Similar Problem

10. Argue from Special Cases

11. Work Backward

12. Eliminate Possibilities

13. The Pigeonhole Principle

14. Use Inductive Reasoning

15. Use Deductive Reasoning

Divisibility of Natural Numbers

1. Be able to use a factor tree or division to find the prime factors of a
number.

2. Know how to write a number in its prime-power representation.

3. Be able find all factors of a number. Know how many there should be.

4. Be able to quickly check if a number is divisible by 2, 3, 5, 6, 7, 8, 9,
10, 11, and 13. Be able to explain or write out each of the rules for the
above numbers. You do not need to prove that they are true.

Greatest Common Factor and Least Common Multiple

1. Use Set Intersection to find GCD(a,b) and LCM(a,b).

2. Use Prime-power representation to find GCD(a,b) and LCM(a,b).

3. Use the Euclidean Algorithm to find GCD(a,b) and LCM(a,b).

Representation and Operations for Integers

1. Be able to use them to following methods to represent integers

(a) “Drops” of Colored Counters
(b) Mail-Time
(c) Number-Line

2. Be able to write and solve word problems using the representations
above for a given equation .

Clock Arithmetic

1. Be able to add, subtract, multiply, and divide in 12-hour clock arithmetic.

2. Be able to add and subtract in clock arithmetic with a base other than
12.

Fractions and Rational Numbers

1. Be able to explain what the “unit” is in any situation.

2. Models for Fractions - Be able to use these models to illustrate a given
fraction.

(a) Colored Regions
(b) Set Model
(c) Fraction Strips
(d) Number-Line

3. Be able to simplify fractions .

4. Be able to find (least) common denominators .

5. Be able to order and compare rational numbers.

6. For the operations, addition, subtraction, multiplication, and division,
be able to create and solve word problems using the models above and
the new ones below:

(a) Area Measurement Model
(b) Sharing Model
(c) Missing Factor Model
(d) Invert and Multiply Algorithm

Other

1. Be able to do conversions from base ten to base n and vice versa. Be
able to add and subtract in bases other than ten.
2. Understand Absolute Value

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