Addition and Subtraction
⭐ MasteredAddition combines numbers and subtraction takes away. They are opposites: if 8 + 5 = 13, then 13 − 5 = 8.
Adding in any order gives the same answer: 3 + 9 = 9 + 3.
All about Addition and Subtraction
Addition combines two or more numbers to make a total. Subtraction takes one number away from another to find the difference. The symbols + and − tell you which operation to do.
Addition and subtraction are opposites. If 8 + 5 = 13, then 13 − 5 = 8. Using column methods, carrying and borrowing help you add and subtract bigger numbers, and mental strategies like counting on make sums easier.
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Real-life uses of Addition and Subtraction
- Totalling the points in a game
- Working out how many sweets are left after sharing
- Checking that a bill adds up correctly
Frequently asked questions about Addition and Subtraction
What is carrying in addition?
When the total of a column is ten or more, you write the units digit and carry the tens digit to the next column.
What is borrowing in subtraction?
When the top digit in a column is smaller, you borrow one ten from the next column to make the subtraction possible.
How can I check my answer?
Use the opposite operation. If you added to get a total, subtract to see whether you return to the starting number.