Page 33 - ICSE Math 6

Number on Number on
Solution: Pair of numbers Comparison
the left the right

(a) 640; 604 604 640 640 > 604
(b) 567; 765 567 765 567 < 765

(c) 98,965; 56,789 56,789 98,965 98,965 > 56,789

EXERCISE 2.1

1. Write the successor of: (a) 2,35,679 (b) 7,86,420 (c) 9,80,099
2. Write the predecessor of: (a) 5,67,000 (b) 34,59,080 (c) 89,00,120
3. Which is the largest whole number?

4. How many whole numbers are there between 46 and 77?
5. Use the number line to find the following sums.

(a) 5 + 6 (b) 3 + 4 (c) 7 + 2
6. Use the number line to find the following differences.
(a) 8 – 5 (b) 6 – 3 (c) 7 – 7

7. Use the number line to find the following products.
(a) 4 × 2 (b) 3 × 5 (c) 7 × 3

8. In each of the following pairs of numbers, state which whole number is on the left of the other
number on the number line. Also, compare them using the appropriate sign ‘>’ or ‘<’.

(a) 387; 378 (b) 1,001; 1,101 (c) 3,456; 6,543 (d) 36,789; 3,67,899
9. How many digits are there in a successor of a three-digit number?

Properties of Whole Numbers

The four fundamental operations on whole numbers are addition, subtraction, multiplication and
division. There are several properties of these operations on whole numbers that help us to understand
the numbers better and make calculations under certain operations very simple. Let us look at these
properties.

I. Addition
• Closure property

The sum of two whole numbers is always a whole number, i.e., if ‘a’ and ‘b’ are two whole numbers
then ‘a + b’ is also a whole number. This property is known as the closure property of addition of
whole numbers. For example, 3 and 5 are whole numbers and 3 + 5 = 8 is also a whole number.
• Commutative property Try These
The sum of two whole numbers remains the same irrespective
of the order in which they are added, i.e., if ‘a’ and ‘b’ are two 1. Is 336 + 423 a whole number?
Why?
whole numbers then a + b = b + a. This property is known as 2. Complete the equation given
the commutative property of addition of whole numbers. For below.
example, 5 + 3 = 8 = 3 + 5 663 + ____ = 900 = 237 + ____

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