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Subtraction

Category : 1st Class

SUBTRACTION

SYNOPSIS

• Subtraction is the opposite of addition.
• Taking away things is called subtraction.
• The words difference, left, remaining, taken away, less etc., mean subtraction.
• The symbol for subtraction is -, read as minus.
• The number from which another number is taken away is called minuend.
• The number that is taken away is called subtrahend.
• The answer we get by subtracting a given number from the other is called difference. Note: The difference of two numbers is lesser than or equal to at least one of the numbers.

• We can subtract numbers using a number line.g., 5 - 4 So, 5 – 4 = 1.

• We can also use our fingers, draw lines and remove objects to subtract numbers.
• Subtracting numbers by writing them in a line (across) is called horizontal subtraction. e.g., 10-4 = 6 ( Across)
• Subtracting numbers by writing them one below the other (down) is called vertical subtraction. • Subtraction using Ones: Subtract the numbers and write the difference. • Subtraction using Tens and Ones: Subtract the ones first, write the difference and then subtract the tens.

e.g., (a) (b) Note: Subtract ones first and then subtract tens.

• Subtracting 0 from a number gives the number itself as difference.

e.g., 6 – 0 = 6

• Subtracting a number from the number itself gives 0 as the difference.

e.g., 3 – 3 = 0

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