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Subtraction Within 20

Learning tasks
              
Lesson Summary
Text book
Exercises Correction
Definitions
    1)  Subtracting Numbers Within 10Ex 1 Ex 2 Ex 3 Ex 4 Ex 5 Ex 6 Ex 7
    2)  Subtracting by Taking Away UnitsEx 8 Ex 9 Ex 10 Ex 11 Ex 12 Ex 13
    3)  Subtracting by Taking Away Units and One TenEx 14 Ex 15 Ex 16 Ex 17 Ex 18 Ex 19 Ex 20
    4)  Subtracting Multiple NumbersEx 21 Ex 22 Ex 23 Ex 24 Ex 25 Ex 26 Ex 27
    5)  Breaking Down NumbersEx 28 Ex 29 Ex 30 Ex 31 Ex 32 Ex 33 Ex 34
Number Line Method
    6)  Subtracting Using the Number LineEx 35 Ex 36 Ex 37 Ex 38 Ex 39 Ex 40
Making 10 Method
    7)  Breaking Down Numbers to Make TenEx 41 Ex 42 Ex 43 Ex 44 Ex 45 Ex 46 Ex 47
    8)  Subtracting from TenEx 48 Ex 49 Ex 50 Ex 51 Ex 52 Ex 53 Ex 54
    9)  Making 10 after Breaking Down NumbersEx 55 Ex 56 Ex 57 Ex 58 Ex 59 Ex 60 Ex 61 Ex 62
    10)  Subtracting Number Within 20Ex 63 Ex 64 Ex 65 Ex 66 Ex 67 Ex 68 Ex 69 Ex 70
Addition and Subtraction Link
    11)  Finding Subtraction Using AdditionEx 71 Ex 72 Ex 73 Ex 74
    12)  Finding the Missing SubtrahendEx 75 Ex 76 Ex 77 Ex 78 Ex 79
    13)  Finding the Total in Subtraction ProblemsEx 80 Ex 81 Ex 82 Ex 83 Ex 84
    14)  Finding the Missing AddendEx 85 Ex 86 Ex 87 Ex 88 Ex 89 Ex 90 Ex 91
    15)  Subtracting by Thinking AdditionEx 92 Ex 93 Ex 94 Ex 95 Ex 96 Ex 97 Ex 98
Problem-Solving Methods
    16)  Solving Real-World ProblemsEx 99 Ex 100 Ex 101 Ex 102 Ex 103 Ex 104 Ex 105 Ex 106 Ex 107 Ex 108