Page 60 - Math Genius C3

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Subtraction of a Number from Itself

When a number is subtracted from itself, we get 0 as the difference.
Examples: (a) 26 – 26 = 0 (b) 324 – 324 = 0 (c) 1248 – 1248 = 0

Subtracting 10, 100 and 1000

Subtracting 10 from a number

When we subtract 10 from a given number, we subtract 1 from the digit at the tens place

and the ones digit remains the same.

Examples: (a) 57 – 10 = 47 (b) 493 – 10 = 483 (c) 1619 – 10 = 1609

Subtracting 100 from a number

When we subtract 100 from a given number, we subtract 1 from the digit at the hundreds

place and the tens and ones digits remain the same.

Examples: (a) 295 – 100 = 195 (b) 587 – 100 = 487 (c) 2699 – 100 = 2599

Subtracting 1000 from a number

When we subtract 1000 from a given number, we subtract 1 from the digit at the

thousands place and the hundreds, tens and ones digits remain the same.

Examples: (a) 9397 – 1000 = 8397 (b) 2695 – 1000 = 1695

Think Tank Critical Thinking
1. If 1000 – 9 = 991, then what is 9000 – 9?
2. What is the difference between 723 tens and 7 thousands 23 tens?

Practice Time 3C

1. Fill in the blanks using subtraction properties.

(a) 273 – 0 = ______ (b) 564 – ______ = 564 (c) 7364 – 0 = ______

(d) 575 – 1 = ______ (e) 649 – ______ = 648 (f) ______ – 1 = 276

2. Subtract the following.

(a) 425 – 10 (b) 896 – 10 (c) 567 – 100

(d) 4364 – 100 (e) 2645 – 1000 (f) 5730 – 1000

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