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Learn: Simple Addition
iGCSE Mathematics
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Welcome!Today we'll learn about simple addition. It's a fundamental skill in mathematics and forms the base for many other operations. Let's explore it step by step!
What is Simple Addition?Addition is the process of combining two or more numbers to find their total or sum. It is one of the four basic operations in arithmetic and is used in everyday life, such as calculating the total cost of items or adding up scores in a game.
The Addition SymbolThe symbol for addition is +. It is placed between the numbers you want to add. For example, 3 + 2 means '3 added to 2'.
Quick check: What does the '+' symbol represent?
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How to Add NumbersTo add numbers, line them up by place value (units, tens, hundreds, etc.). Start from the rightmost digit and move left. If the sum of digits in a column is greater than 9, carry over the extra value to the next column on the left.
Match the items on the left with their correct pairs on the right
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Adding Larger NumbersWhen adding larger numbers, the same rules apply. Break the problem into smaller steps by adding column by column, starting from the rightmost digit. Don't forget to carry over if the sum exceeds 9!
When adding 245 and 378, the sum of the digits in the unit column is {{blank0}}, and after carrying over, the sum in the tens column is {{blank1}}.
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Adding DecimalsWhen adding decimals, align the numbers by the decimal point. Add each column starting from the right, just like whole numbers. Ensure the decimal point remains in the correct position in your answer.
Match the items on the left with their correct pairs on the right
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Adding Negative NumbersWhen you add a negative number, it is the same as subtracting its absolute value. For example, 5 + (-3) means 5 minus 3, which equals 2. Think of it as moving to the left on a number line.
Quick check: What is 7 + (-4)?
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Common Errors in AdditionOne common mistake in addition is forgetting to carry over when the sum of a column exceeds 9. Another is misaligning numbers when adding decimals, which leads to incorrect placement of the decimal point in the answer.
Match the items on the left with their correct pairs on the right
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Review Time!Great work! You've learned about simple addition, adding whole numbers, decimals, and negative numbers. Let's test your understanding with a few questions.
Which of the following statements about addition are true? (Select all that apply)
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Match the items on the left with their correct pairs on the right
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When adding 12.4 + 7.8, the sum is {{blank0}}.
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What is 14 + (-9)?
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Congratulations!You've completed the lesson on simple addition. Keep practising to strengthen your skills and you'll master addition in no time!
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