Basic Math: Subtraction
Click on the document below to print out a tracking sheet that will get you started on the Subtraction Unit.
Introduction
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| Concept/Skill | Sample | Learn Zillion | Khan Academy | Breakthrough to Math, Level 1, Book 3 | Foundations Mathematics | Number Power 1 | Breakthrough to Math, Workbook | WorkWise: Math at Work |
| What is subtraction? | 7-5 means you have 7 and take 5 away to have 2 left | 6-10 | 29 | 17 | ||||
| Introduction to Subtraction |
Problem Solving
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| Concept/Skill | Sample | Learn Zillion | Khan Academy | Breakthrough to Math, Level 1, Book 6 | Foundations Mathematics | Number Power 1 | Breakthrough to Math, Workbook | WorkWise: Math at Work |
| Solving subtraction word problems | If you had $123 but you spent $17, how much do you have left? | Subtraction Word Problems with 10 | 9-12 | 36-38 | 52-56 |
20-21 Exercise 2
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Calculations
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| Concept/Skill | Sample | Learn Zillion | Khan Academy |
Breakthrough to Math, Level 1, Book 3 |
Foundations Mathematics | Number Power 1 | Breakthrough to Math, Workbook | WorkWise: Math at Work |
| Subtraction Facts within 10 | 8-3=5 | Subtracting different ways | 11-13 |
28-29 (skip problems with numbers greater than 10) |
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| Subtraction Facts within 20 | 13-6=7 | Subtract within 20 by subtracting parts: Video | Subtracting 14-6 | 35-36 | 30-32 | |||
| Subtracting 2-, 3-, and 4- digit numbers | 379-51=228 | 14-23 |
37-38 (Problems #1-10) |
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| Subtracting 1s, 10s, or 100s | ||||||||
| Borrowing | 501-289=212 | Solve subtraction problems: using regrouping: Video | Worked example: Subtracting 3-digit numbers (regrouping) | 24-56 | 32-34 | 39-42 | 37-42 | |
| Concept/Skill | Sample | Learn Zillion | Khan Academy |
Breakthrough to Math, Level 1, Book 3 |
Foundations Mathematics | Number Power 1 | Breakthrough to Math, Workbook | WorkWise: Math at Work |
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Problem Solving Post-Test
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1. In the Breakthrough to Math, Level 1, Workbook, complete Worksheet 62 (p 64). It is OK to use a calculator for this post-test. |
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2. Answers can be found on page 80. |
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| 3. A passing score is 8 out of 10. |
Calculations Post-Test
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In the Breakthrough to Math, Level 1, Book 3, complete the Post Test on page 60. You may NOT use a calculator for this post-test. |
| 2. Answers can be found on page 61. | |
| 3. A passing score is 10 out of 11. |