Class 3 Maths - ICSE
Subtraction
In this chapter, Class 3 ICSE students will learn the fundamental operations of subtraction with numbers up to 4 digits. The chapter builds upon Class 2 concepts by introducing subtraction without and with regrouping, commonly known as borrowing. Students will practice subtracting 2-digit, 3-digit, and 4-digit numbers in columns, solving word problems based on real-life situations, and verifying answers using addition. Mastering subtraction is crucial for scoring well in ICSE board assessments, as it forms the backbone of arithmetic problem-solving, builds strong calculation speed, and appears frequently in both objective and descriptive question formats.
Start Learning FreeKey Concepts
Minuend, Subtrahend, and Difference
The minuend is the number you subtract from, the subtrahend is the number you are taking away, and the difference is the final answer you get after subtracting.
Subtraction Without Borrowing
When each digit in the subtrahend is smaller than or equal to the corresponding digit in the minuend, you can simply subtract column by column from right to left.
Subtraction With Regrouping (Borrowing)
When a digit in the subtrahend is larger than the corresponding digit in the minuend, you must borrow 1 from the immediate left column to make subtraction possible.
Checking Subtraction with Addition
You can always check if your subtraction is correct by adding the difference to the subtrahend; the sum should equal the original minuend.
Word Problems in Subtraction
Real-life problems that use key phrases like 'left', 'remain', 'how much more', or 'take away' to indicate that subtraction is needed to find the answer.
Important Formulas
Board Exam Info
In the ICSE Class 3 Mathematics examinations, the Subtraction chapter typically carries around 8 to 12 marks. Common question types include column subtraction with and without regrouping, fill-in-the-blanks using properties of subtraction, checking answers via addition, and 2-step word problems.
Frequently Asked Questions
How do I know when to borrow during subtraction?
You need to borrow when the top digit (minuend) is smaller than the bottom digit (subtrahend) in any column.
Can we subtract a bigger number from a smaller number in Class 3?
No, in Class 3, we always subtract the smaller number (subtrahend) from the larger number (minuend).
Why do we always start subtracting from the Ones place?
We start from the Ones place on the right so that if we need to borrow, we can easily take it from the Tens place next to it.
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