Addition 
Subtraction 
Multiplication 
Division 
Fractions 
Decimals & Percents 
Calculator Achievement 
Life-Skills Math Power 
Algebra 1 
Algebra 2 
Geometry 
Trigonometry 
Subtraction- Index
Subtraction
Unit 1: Subtraction and Place Numbers
Lessons
- Introduction to Subtraction and Place Numbers
- 6 Flash Cards
- 7 Subtraction Facts
- 8 Subtracting Items
- 9 Subtracting One-Place Numbers
- 10 Problem-Solving
- 11 Problem-Solving
- 12 Subtracting One-Place Numbers
- 13 Subtracting One-Place Numbers
Problems
- 8 Subtracting Items
- 9 Subtracting One-Place Numbers
- 10 Problem-Solving
- 11 Problem-Solving
- 12 Subtracting One-Place Numbers
- 13 Review: Subtracting One-Place Numbers
Tests
- 14 Test 1
- 15 Additional Help
- 16 Double-Check Test 1
- 87 Triple-Check Additional Help
- 88 Triple-Check Test 1
On Location
Unit 2: Subtracting One to Four-Place Numbers
Lessons
- Introduction to Subtracting One to Four-Place Numbers
- 17 Subtracting Two-Place Numbers
- 18 Checking Answers
- 20 Find the Missing Number
- 21 Problem-Solving-Phrases Used in Subtraction
- 22 Problem-Solving
- 23 Subtracting Three and Four-Place Numbers
- 24 Subtracting One to Four-Place Numbers
- 26 Problem-Solving
Problems
- 17 Subtracting Two-Place Numbers
- 18 Checking Answers
- 19 Checking Subtraction Problems
- 20 Find the Missing Number
- 21 Problem-Solving-Phrases Used in Subtraction
- 22 Problem-Solving
- 23 Subtracting Three and Four-Place Numbers
- 24 Subtracting One to Four-Place Numbers
- 25 Subtracting One to Four-Place Numbers
- 26 Problem-Solving
Tests
- 27 Test 2
- 28 Additional Help
- 29 Double-Check Test 2
- 89 Triple-Check Additional Help
- 90 Triple-Check Test 2
On Location
- Introduction to Subtracting One to Four-Place Numbers
- 17 Subtracting Two-Place Numbers (1 of 2)
- 17 Subtracting Two-Place Numbers (2 of 2)
- 18 Checking Answers (1 of 2)
- 18 Checking Answers (2 of 2)
- 20 Find the Missing Number
- 21 Problem-Solving-Phrases Used in Subtraction
- 22 Problem-Solving (1 of 2)
- 22 Problem-Solving (2 of 2)
- 23 Subtracting Three and Four-Place Numbers
- 24 Subtracting One to Four-Place Numbers
- 26 Problem-Solving
Unit 3: Borrowing to Subtract
Lessons
- Introduction to Borrowing to Subtract
- 30 Understanding Numbers
- 31 Understanding Numbers
- 32 Borrowing to Subtract
- 33 Borrowing to Subtract
- 34 Borrowing to Subtract
- 35 Problem-Solving
- 36 Review: Borrowing to Subtract
Problems
- 31 Understanding Numbers
- 33 Borrowing to Subtract
- 34 Borrowing to Subtract
- 35 Problem-Solving
- 36 Review: Borrowing to Subtract
Tests
- 37 Test 3
- 38 Additional Help
- 39 Double-Check Test 3
- 91 Triple-Check Additional Help
- 92 Triple-Check Test 3
On Location
Unit 4: Borrowing More Than Once
Lessons
- Introduction to Borrowing More Than Once
- 40 Deciding When to Borrow
- 41 Problem-Solving
- 42 Borrowing With Three-Place Numbers
- 43 Deciding When to Borrow With Larger Numbers
- 44 Problem-Solving
- 45 Borrowing More Than Once
- 46 Practice Borrowing
- 47 Practice Borrowing
- 48 Problem-Solving
Problems
- 40 Deciding When to Borrow
- 41 Problem-Solving
- 42 Borrowing With Three-Place Numbers
- 43 Deciding When to Borrow With Larger Numbers
- 44 Problem-Solving
- 45 Borrowing More Than Once
- 46 Practice Borrowing
- 47 Practice Borrowing
- 48 Problem-Solving
Tests
- 49 Test 4
- 50 Additional Help
- 51 Double-Check Test 4
- 93 Triple-Check Additional Help
- 94 Triple-Check Test 4
On Location
- Introduction to Borrowing More Than Once
- 40 Deciding When to Borrow
- 41 Problem-Solving
- 42 Borrowing With Three-Place Numbers (1 of 2)
- 42 Borrowing With Three-Place Numbers (2 of 2)
- 43 Deciding When to Borrow With Larger Numbers
- 44 Problem-Solving (1 of 2)
- 44 Problem-Solving (2 of 2)
- 45 Borrowing More Than Once
- 46 Practice Borrowing
- 47 Practice Borrowing
- 48 Problem-Solving
Unit 5: Borrowing From Zeros
Lessons
- Introduction to Borrowing From Zeros
- 52 Borrowing From One Zero
- 54 Problem-Solving
- 55 Borrowing From Two Zeros
- 56 Borrowing From One and Two Zeros
- 57 Problem-Solving
- 58 Borrowing From Larger Numbers
- 59 Problem-Solving
- 60 Borrowing From Separated Zeros
- 61 Problem-Solving
- 62 Review: Subtracting From Zeros
Problems
- 52 Borrowing From One Zero
- 53 Borrowing From One Zero
- 54 Problem-Solving
- 55 Borrowing From Two Zeros
- 56 Borrowing From One and Two Zeros
- 57 Problem-Solving
- 58 Borrowing From Larger Numbers
- 59 Problem-Solving
- 60 Borrowing From Separated Zeros
- 61 Problem-Solving
- 62 Review: Subtracting From Zeros
Tests
- 63 Test 5
- 64 Additional Help
- 65 Double-Check Test 5
- 95 Triple-Check Additional Help
- 96 Triple-Check Test 5
On Location
Unit 6: Problem-Solving
Lessons
- Introduction to Problem-Solving
- 66 Subtracting Money
- 67 Problem-Solving
- 68 Problem-Solving-Subtraction/Additional Information
- 69 Problem-Solving
- 70 Problem-Solving-Subtraction and Addition
- 71 Problem-Solving-Thinking Math
- 72 Problem-Solving-Thinking Math
- 73 Measurements-Subtraction and Addition
- 74 Picture Problems
- 75 Check-Writing
- 76 Check-Writing
- 77 Check-Writing
- 78 Bank Deposits and Check-Writing
- 80 Comparing Prices
Problems
- 66 Subtracting Money
- 67 Problem-Solving
- 68 Problem-Solving-Subtraction/Additional Information
- 69 Problem-Solving
- 70 Problem-Solving-Subtraction and Addition
- 71 Problem-Solving-Thinking Math
- 72 Problem-Solving-Thinking Math
- 73 Measurements-Subtraction and Addition
- 74 Picture Problems
- 75 Check-Writing
- 76 Check-Writing
- 77 Check-Writing
- 78 Bank Deposits and Check-Writing
- 79 Checking Accounts
- 80 Comparing Prices
Tests
- 81 - 82 Final Examination
- 83 - 84 Additional Help: Final Examination
- 85 - 86 Double-Check Final Examination
- 97 - 98 Triple-Check Additional Help: Final Examination
- 99 - 100 Triple-Check Final Examination
- 101 - 102 Assessment: Subtraction Book 2
On Location
- Introduction to Problem-Solving
- 66 Subtracting Money (1 of 2)
- 66 Subtracting Money (2 of 2)
- 67 Problem-Solving
- 68 Problem-Solving-Subtraction/AdditionaI Information
- 69 Problem-Solving
- 70 Problem-Solving-Subtraction and Addition
- 71 Problem-Solving-Thinking Math
- 72 Problem-Solving-Thinking Math
- 73 Measurements-Subtraction and Addition
- 74 Picture Problems
- 76 Check-Writing
- 78 Bank Deposits and Check-Writing
- 80 Comparing Prices
- Lessons
- Problems
- Tests
- On Location
- Lessons
- Problems
- Tests
- On Location
Menu
Placement TestUnit 1
Subtraction and Place Numbers
Unit 2
Subtracting One to Four-Place Numbers
Unit 3
Borrowing to Subtract
Unit 4
Borrowing More Than Once
Unit 5
Borrowing From Zeros
Unit 6
Problem-Solving
Unit 4: Borrowing More Than Once
- Introduction to Borrowing More Than Once01:48
- 40Deciding When to Borrow02:17
- 41Problem-Solving01:33
- 42Borrowing With Three-Place Numbers (1 of 2)01:22
- 42Borrowing With Three-Place Numbers (2 of 2)02:48
- 43Deciding When to Borrow With Larger Numbers01:19
- 44Problem-Solving (1 of 2)02:55
- 44Problem-Solving (2 of 2)01:31
- 45Borrowing More Than Once01:37
- 46Practice Borrowing01:47
- 47Practice Borrowing02:41
- 48Problem-Solving01:27
Subtraction-Borrowing With Three-Place Numbers
Observation deck of the Sears tower: If the elevator is on the 103rd floor and the tower is 110 stories tall, how many more stories can the elevator go? If the Sears tower is 1,454' tall and the Empire State Building is 1,250' tall, how much taller is the Sears tower?