# Our Books Available on Amazon

Our student workbooks are designed to let students discover the joy in math. Through non-routine, interesting and challenging problems, they build up a strong foundation in their understanding. Working through these problems, students will discover the relationships between numbers, build up their number sense and develop a headstart in early algebraic thinking. Instead of drilling, emphasis is placed on logic reasoning, high order thinking skills and problem solving.

## Addition and Subtraction Series Book 1

### Addition and Subtraction for Numbers to 20: Challenging Math Questions Using Singapore Strategies

This set of problems focus on 1st Grade Addition and Subtraction for numbers from 1 to 20, and is divided into three parts. The first part introduces number sense, place value, addition and subtraction skills for numbers to 10. The second part focuses on place value and addition for numbers to 20. Along the way, students practice concepts such as making tens, adding tens and ones, derived facts doubles, missing addends, decomposing to10 and more. The third part extends to subtraction for numbers to 20 and introduces 12 different types of word problems for addition and subtraction to 20.

Workbook - Addition and Subtraction for Numbers to 20

## Addition and Subtraction Series Book 2

### Addition and Subtraction for Numbers 20 to 100: Challenging Math Questions Using Singapore Strategies

This set of problems focus on 1st Grade Addition and Subtraction for numbers 20 to 100, and is divided into four parts. The first part introduces number sense and place value for numbers to 40, with practice questions for counting, place value, comparing numbers, order and pattern. In the second part, students work on basic addition and subtraction for numbers to 40, first without regroup, then with regroup. Additional exercises are included to extend the concepts to adding three numbers and word problems. The third part introduces mental math strategies for addition and subtraction. The final part extends the student’s understanding of addition and subtraction to numbers to 100, following the same progression as the first parts of the workbook.

Workbook - Addition and Subtraction for Numbers 20 to 100

## Addition and Subtraction Series Book 3

### Addition and Subtraction for Numbers to 1000: Challenging Math Questions Using Singapore Strategies

This set of problems focus on 2nd Grade Addition and Subtraction for numbers to 1,000, and is divided into three parts. The first part deals with addition to 1,000. After reinforcing the fundamentals such as counting, place value, comparing numbers, order and pattern, students work on basic addition to 1,000, first without regroup, then sequentially – regrouping in ones and tens. The second part follows the same track for subtraction – without regroup, then regrouping in hundreds, tens and ones, with an additional section on subtraction across zeros. The final part focuses on solving word problems using bar models, including two-step problems.