Natural Numbers & Whole Numbers — Multiple Choice Questions

The whole number that does not have its predecessor is:

1. 1

2. 0

3. 2

4. 100

Answer

The predecessor of a whole number is obtained by subtracting 1 from it.

The predecessor of 0 would be 0 - 1 = -1, which is not a whole number.

So, 0 is the only whole number that does not have a predecessor.

Hence, option 2 is the correct option.

The predecessor of ten thousand is:

1. 10001

2. 9999

3. 1001

4. 999

Answer

Ten thousand = 10000.

Predecessor of 10000 = 10000 - 1 = 9999.

Hence, option 2 is the correct option.

The value of 43 × 27 + 43 × 73 is equal to:

1. 4300

2. 43000

3. 3166

4. 1234

Answer

Using the Distributive Law of Multiplication over Addition:

43 × 27 + 43 × 73 = 43 × (27 + 73)

= 43 × 100 = 4300.

Hence, option 1 is the correct option.

484 × 101 is equal to:

1. 48848

2. 44888

3. 48884

4. 48404

Answer

484 × 101 = 484 × (100 + 1)

Using the Distributive Law of Multiplication over Addition:

= 484 × 100 + 484 × 1

= 48400 + 484 = 48884.

Hence, option 3 is the correct option.

57 × 13 - 57 × 3 is equal to:

1. 57 × 16

2. 57 × 10

3. none of these

Answer

Using the Distributive Law of Multiplication over Subtraction:

57 × 13 - 57 × 3 = 57 × (13 - 3) = 57 × 10.

Hence, option 2 is the correct option.

(17 ÷ 17) - (97 ÷ 97) is equal to:

1. 1

2. 2

3. 0

4. Can't be determined.

Answer

Every non-zero whole number divided by itself gives 1.

(17 ÷ 17) - (97 ÷ 97) = 1 - 1 = 0.

Hence, option 3 is the correct option.

The number line for the whole numbers between 3 and 7 is:

Answer

The whole numbers between 3 and 7 are 4, 5 and 6.

The correct number line is the one in which only the points 4, 5 and 6 are marked between 3 and 7.

Hence, option 2 is the correct option.

The product of the greatest number of two digits and the smallest two digit number is:

1. 999

2. 990

3. 900

4. 980

Answer

The greatest number of two digits = 99.

The smallest number of two digits = 10.

Product = 99 × 10 = 990.

Hence, option 2 is the correct option.

If a ÷ a = a, then a is:

1. 10

2. 0

3. 1

4. none of these

Answer

For every non-zero whole number, a ÷ a = 1.

So, a ÷ a = a means a = 1.

Hence, option 3 is the correct option.

If 8 - (a - 7) = 8 + (4 - b), then:

1. a = 4, b = 7

2. a = -4, b = -7

3. a = 4, b = -7

4. a = -4, b = 7

Answer

L.H.S. = 8 - (a - 7) = 8 - a + 7 = 15 - a.

R.H.S. = 8 + (4 - b) = 8 + 4 - b = 12 - b.

So, 15 - a = 12 - b, which gives b - a = -3.

Substituting values from option 2:

⇒ a = -4 and b = -7 gives b - a = -7 - (-4) = -3.

Hence, option 2 is the correct option.