About out Worksheet series
Our supplementary worksheets are meant to add more exercises for each topic presented in the Math In Focus and Primary Mathematics textbooks and workbooks. Teachers can use these exercises after going through each chapter in the workbooks as additional exercises or homework assignment.
About this set of worksheets
This set of worksheets is part of our series to support teachers and students using Singapore Strategies.
This pack can be used as a stand-alone product, or as a supplement to your core math curriculum. It can also be used to promote higher order thinking where students are challenged to transfer their basic skills to more demanding questions. The specified item introduced from the Common Core Standards are indicated on each page.
- Subtraction to 20
This worksheet can be used to supplement
Math in Focus Workbook 1A
- Chapter 8 Addition and Subtraction Facts to 20 (pages 203 to 210)
Primary Mathematics Series (Common Core Edition 1A)
- Chapter 6 Numbers to 20 (pages 115 to 132)
Total pages: 54
The topics include:
Operations and Algebraic Thinking (1.OA)
Represent & solve problems involving addition & subtraction
A1: Addition and subtraction within 20 to solve word problems
(includes the 11 common addition and subtraction situations as listed in the common core - add to, put together-take apart, take from and compare)
Understand and apply properties of operations and the relationship
between addition and subtraction.
B3: Apply properties of operations as strategies to add and subtract.
B4: Understand subtraction as an unknown-addend problem. For example,
subtract 10 – 8 by finding the number that makes 10 when added to 8.
B5: Relate counting to addition and subtraction (e.g., by counting on 2 to add 2).
Add and subtract within 20.
C5: Relate counting to addition and subtraction
C6: Add and subtract. Use strategies such as counting on, making ten, relationship between addition and subtraction. Specifically, this set of worksheets uses Singapore Math strategies such as number bonds for addition, subtraction and setting family of number sentences, among others.
Work with addition and subtraction equations.
D7: Understand the meaning of the equal sign, and determine if equations involving addition and subtraction are true or false. For example, which of the following equations are true and which are false? 6 = 6, 7 = 8 – 1, 5 + 2 = 2 + 5, 4 + 1 = 5 + 2.
D8: Determine the unknown whole number in an addition or subtraction
equation relating three whole numbers.
For example, determine the unknown number that makes the equation true in each of the equations 8 + ? = 11, 5 = ? – 3, 6 + 6 = ?.
This set of worksheet also concludes with some challenging and revision questions.