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5/32 MCQs for:

NUMBER & NUMERATION: Natural Numbers

If n is a natural number, which of the following is true?

n × n = n.

n - n = n.

n + n = 2n.

None of the above.

If x is a natural number, which of the following expressions could yield a natural number?

x ÷ 2 when x = 2.

x - 1 when x = 1.

x + 1 when x = 0.

All are correct.

If a natural number is multiplied by 0, what is the result?

0.

The original number.

1.

Undefined.

How many prime numbers are less than 20?

9.

8.

7.

10.

Which of the following represents a sequence of natural numbers?

{-1, 0, 1, 2}.

{1, 1, 2, 3, ...}.

{0, 1, 2, 3, ...}.

{1, 2, 3, 4, ...}.