Unlock harder levels by getting an average of 80% or higher.

Earn up to 5 stars for each level
The more questions you answer correctly, the more stars you'll unlock!

Each game has 10 questions.
Green box means correct.
Yellow box means incorrect.

Unlock harder levels by getting an average of 80% or higher.

Earn up to 5 stars for each level
The more questions you answer correctly, the more stars you'll unlock!

Each game has 10 questions.
Green box means correct.
Yellow box means incorrect.

More Ways To Use Math Games
Game Quickplay
Video Help

Need some help or instruction on how to do this skill?

Offline Worksheets

Want a paper copy? Print a generated PDF for this skill.

Top Mathematicians Leaderboards

See how you scored compared to other students from around the world.

Start a MathJam

Learn Math Together.

Math Games for Teachers

Primary 2 - Number and Algebra: Whole Numbers

Standard 2.NA-WN.2 - Practice solving subtraction sentences up to 100.

Included Skills:

Addition and Subtraction
2.1 addition and subtraction algorithms (up to 3 digits)
2.2 solving up to 2-step word problems involving addition and subtraction
2.3 mental calculation involving addition and subtraction of a 3-digit number and ones/tens/hundreds
2.4 write addition and subtraction equations for number stories and explain the meaning of the equal sign.
2.5 achieve mastery of basic addition and subtraction facts within 20 by
- writing a family of 4 basic facts within 20 given any one of the basic facts (e.g. 9 + 7 = 16, 7 + 9 = 16, 16 – 9 = 7 and 16 – 7 = 9 are a family of addition and subtraction facts).
- playing games, including applets and digital games.
2.6 work in groups using the base-ten set/play money to illustrate the standard algorithms for addition and subtraction up to 3 digits.
2.7 use the part-whole and comparison models to illustrate the concepts of addition and subtraction and use the models to determine which operation (addition or subtraction) to use when solving 1-step word problems.
2.8 use the comparison model to reinforce the language of comparison such as "Ali has 30 more stickers than Siti."
2.9 solve 2-part word problems (1 step for each part) before solving 2-step word problems.
2.10 achieve mastery of addition and subtraction algorithms up to 3 digits by playing games, including applets and digital games.
2.11 work in groups to create word problems involving addition and subtraction for other groups to solve.

If you notice any problems, please let us know.