Number Sense, Addition and Subtraction

The first building block of elementary mathematics education is number sense, along with addition and subtraction. It starts at kindergarten and forms the core of the first and second grade curriculum.

Addition and Subtraction for numbers to 10

Number Sense, Addition and Subtraction

Once students gain number sense and become comfortable with counting and associating quantities with numbers, the notion of how far apart a pair of numbers are introduced, which naturally leads to the concepts of addition and subtraction.

Related Posts

Article on Singapore math from Economist.com

Article on Singapore math from Economist.com

On Aug 30, 2018, there was an article from The Economist, titled “What…

Singapore Math In-Depth National Conference 2018

2018 Singapore Math In-Depth National Conference and Standards Institute

This summer, I had the privilege of presenting at two of my favorite…

draw bar models correctly

Why is it Important to Draw Bar Models Correctly

In the previous post, we talked about two common mistakes in drawing bar…

Common Mistakes in Bar Models

Common Mistakes in Bar Models

Bar Modeling is a very powerful heuristic in Singapore math. Representing unknown quantities…

What is Singapore math?

What is Singapore math?

One of the questions we get most often is “What is Singapore math?”…

bar model example

Bar Model example – Before After

Here is a bar model example for “before and after” type of word…


Related Worksheets

(Worksheets are part of our Members’ Resources)

Grade 1:

Grade 2:

Grade 3:

Grade 4:

Grade 5:

Looking for full grade lesson plans?


Join our membership program. Start your Free Trial!

singapore math resources

Our full-year Singapore math resources are aligned with major Singapore based textbooks, such as Math in Focus, Primary Mathematics etc. These resources, including lesson plans, videos, worksheets and more, are available for unlimited access (all grades) in our membership program.


The Starting Point – Number Sense, Addition and Subtraction

Number sense can refer to “an intuitive understanding of numbers, their magnitude, relationships, and how they are affected by operations”, for example the ability to understand quantities and concepts like more and less.

This skill is then extended to the understanding how far two numbers are separated, which leads naturally to the concepts of adding and subtracting. This is introduced in steps, starting with numbers within 10 (i.e. within single digit numbers up to 10), then extending to more place values, numbers to 20, 40 and 100 (first grade), then to 1,000 (second grade), 10,000 (third grade), and onto higher orders in grades four and five.

Developing these foundation skills takes up the main part of the first and second grade elementary mathematics curriculum – developing number sense, understanding the two basic operations, and extending to multiple place values. It is one of the most important part of a student’s learning in elementary school.


Free Worksheets

Looking for some practice questions on Addition and Subtraction for numbers to 10? Click here to download a free set of pdf worksheets now!


Join our membership to get all our math resources for grades 1 to 5

Scroll to Top