Use efficient written methods to add and subtract whole numbers and decimals with up to two places

Balancing Sums
An excellent tool for reinforcing an understanding of the role of the equals sign. Choose one objective, or many. You can choose all the objectives for a single year group (or multiple year groups). You can also choose to balance between different types of calculations (eg addition and multiplication).

For more addition and subtraction resources click here.

Game availability:

Online in HTML5 format
Balancing Sums ?
Addition - Crystal Crash
A fun game to practise mental addition skills. The game was designed to cover all the mental addition objectives in the new math curriculum. You can choose one objective, or choose all the objectives for a year group.

This game will work on any device in your browser.

Game availability:

Online in HTML5 format
Addition - Crystal Crash ?
Adding Decimals - Digit Drag
Drag the digits to add decimal numbers and make a given total.

Game availability:

Online in HTML5 format
Adding Decimals - Digit Drag ?
Column Subtraction
Working towards an efficent method of column subtraction. Can be used to demonstate expanded subtraction (in which the numbers are partitioned) with or without the need for borrowing.

For more addition and subtraction resources click here.

This game is now part of the 'Calculations' collection, which includes the following 17 games and resources: Column Addition, Expanded Addition, Expanded Addition - Place Value Counters, Number Bonds(2), Addition - Digit Drag, Missing Symbols, Column Subtraction, Column Subtraction using Place Value Counters, Counting on to find difference on a beadstring, Multiplication Grid Method, Multiplication Written Method, Ratio and Scaling Numbers, Representing Multiplication, Division by Chunking Up, Division by Chunking Down, Formal Written Division - Round Up or Down?, Short Division Writen Formal Method.

The Calculations app is available on Google Play and the App Store.

Game availability:

Online in HTML5 format
Column Subtraction ?
Column Addition
The next step towards an efficient formal method of column addition. Add the numbers starting with the least significant, then combine the partitioned result. Choice of 2-digit, 3-digit or 4-digit.

For more addition and subtraction resources click here.

Game availability:

Online in HTML5 format
Column Addition ?
Expanded Addition
Add the partitioned numbers beginning with the largest. Choice of 2-digit, 3-digit or 4-digit numbers. An important conceptual step before a more formal method of column addition.

For more addition and subtraction resources click here.

This game is now part of the 'Calculations' collection, which includes the following 17 games and resources: Column Addition, Expanded Addition, Expanded Addition - Place Value Counters, Number Bonds(2), Addition - Digit Drag, Missing Symbols, Column Subtraction, Column Subtraction using Place Value Counters, Counting on to find difference on a beadstring, Multiplication Grid Method, Multiplication Written Method, Ratio and Scaling Numbers, Representing Multiplication, Division by Chunking Up, Division by Chunking Down, Formal Written Division - Round Up or Down?, Short Division Writen Formal Method.

The Calculations app is available on Google Play and the App Store.

Game availability:

Online in HTML5 format
Expanded Addition ?
Subtraction - Crystal Crash
The game was designed to cover all the mental subtraction objectives in the new maths curriculum. You can choose one objective, or choose all the objectives for a year group.

This game will work on any tablet or computer.

Game availability:

Online in HTML5 format
Subtraction - Crystal Crash ?