Basic Math: Subtraction
Click on the document below to print out a tracking sheet that will get you started on the Subtraction Unit.
Introduction


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?  75 means you have 7 and take 5 away to have 2 left  610  29  17  
Introduction to Subtraction 
Problem Solving


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  912  3638  5256 
2021 Exercise 2

Calculations



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  83=5  Subtracting different ways  1113 
2829 (skip problems with numbers greater than 10) 

Subtraction Facts within 20  136=7  Subtract within 20 by subtracting parts: Video  Subtracting 146  3536  3032  
Subtracting 2, 3, and 4 digit numbers  37951=228  1423 
3738 (Problems #110) 

Subtracting 1s, 10s, or 100s  
Borrowing  501289=212  Solve subtraction problems: using regrouping: Video  Worked example: Subtracting 3digit numbers (regrouping)  2456  3234  3942  3742  
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 


Problem Solving PostTest
1. In the Breakthrough to Math, Level 1, Workbook, complete Worksheet 62 (p 64). It is OK to use a calculator for this posttest. 

2. Answers can be found on page 80. 

3. A passing score is 8 out of 10. 
Calculations PostTest
In the Breakthrough to Math, Level 1, Book 3, complete the Post Test on page 60. You may NOT use a calculator for this posttest.  
2. Answers can be found on page 61.  
3. A passing score is 10 out of 11. 