Class 3 Maths - ICSE
Addition
In this chapter, Class 3 ICSE students build upon their previous knowledge of addition by learning how to add 3-digit and 4-digit numbers with and without regrouping (carrying over). Students explore properties of addition like the order and grouping properties, and solve real-life word problems. Mastering addition is essential for the ICSE Mathematics curriculum as it forms the foundational building block for advanced arithmetic operations, multiplication, and money calculations in later classes, frequently appearing in board exam assessments.
Start Learning FreeKey Concepts
Addition without Regrouping
Adding numbers column by column starting from the ones place when the sum of digits in any column is less than 10.
Addition with Regrouping (Carrying Over)
When the sum of digits in a column is 10 or more, we write the ones digit and carry over the tens digit to the next column on the left.
Order Property of Addition
Changing the order of the addends does not change the sum (for example, 24 + 15 is equal to 15 + 24).
Property of Zero
When zero is added to any number, the sum is the number itself (for example, 456 + 0 = 456).
Word Problems in Addition
Reading story sums carefully to identify key words like 'total', 'altogether', and 'sum', and setting up column addition to solve them.
Important Formulas
Board Exam Info
In the ICSE Class 3 Mathematics examinations, the Addition chapter typically carries around 10 to 15 marks. Common question types include direct column addition (with and without carrying), fill-in-the-blanks using properties of addition, finding the missing digits, and 2-step word problems.
Frequently Asked Questions
Why do we start adding from the ones place?
We always start from the ones place so that if the sum is 10 or more, we can easily carry over the extra tens to the next column.
What is a 'carry over' in addition?
When the sum in a column is 10 or greater, we write down the ones digit in the answer space and move the tens digit to the top of the next column on the left.
How do I know if a word problem requires addition?
Look for words like 'altogether', 'total', 'sum', and 'combined', which tell you to put different amounts together by adding.
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