8 (a) Write down (i) the number twenty-seven million, three hundred sixty thousand, forty-five in figures, (ii) the six factors of 20, (iii) a fraction that is equivalent to 7/9, (iv) a prime number between 30 and 40. 9 Work out (a) -6 + +12 (b) +5 - -7 (c) -9 x +4 (d) +72 +9

Twenty-seven million is 27,000,000.
Three hundred sixty thousand is 360,000.
Forty-five is 45.

The number is $\boxed{\text{27,360,045}}$.

• $1 \times 20 = 20$
• $2 \times 10 = 20$
• $4 \times 5 = 20$ The factors are 1, 2, 4, 5, 10, 20. The six factors of 20 are $\boxed{\text{1, 2, 4, 5, 10, 20}}$.

Let's use 2.

An equivalent fraction is $\boxed{\frac{14}{18}}$.

31, 32, 33, 34, 35, 36, 37, 38, 39.

• 31 is prime.
• 32 is divisible by 2.
• 33 is divisible by 3.
• 34 is divisible by 2.
• 35 is divisible by 5.
• 36 is divisible by 2.
• 37 is prime.
• 38 is divisible by 2.
• 39 is divisible by 3. A prime number between 30 and 40 is $\boxed{\text{31}}$ (or 37).

9 Work out

Since the signs are different, subtract the smaller absolute value from the larger absolute value and keep the sign of the number with the larger absolute value.

The result is $\boxed{6}$.

The result is $\boxed{-2}$.

A negative number multiplied by a positive number results in a negative number.

The result is $\boxed{-36}$.

A negative number divided by a positive number results in a negative number.

The result is $\boxed{-8}$.