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You might think it's not important to know that 2, 4 and 6 are even numbers. This is true when doing simple calculations such as 6 + 3. Whether they are odd or even has little bearing on the sum. However, if you want to go into a career where a thorough understanding of math is vital ~ and there are plenty of them ~ you'll need to know a lot more about numbers than how to do basic calculations.

1.

If a number is divisible by 10, what must the final digit of the number be?

1

5

0

4

You can cancel the zero in the number with the zero in ten and write the answer straight away, e.g. 120 ÷ 10 = 12

2.

Which of the following statements is wrong?

For every positive number there is a negative number

There are more positive numbers than negative numbers

The smallest non negative even number is 2

The smallest non negative odd number is 1

Not so! For every positive number there is a negative number, e.g. 2 and -2, 1,000 and -1,000, 3.4 and -3.4: this goes on and on without end for every number you care to think of

3.

Which words do not describe the numbers 2, 4, 6 and 8?

Odd numbers

Even numbers

Whole numbers

Multiples of two

They are all whole even numbers and multiples of 2

4.

What do you always get when you add a positive whole number and a negative whole number?

Either a positive or negative number

A negative number

A positive number

Either a positive number or negative number or zero

For example: 6 + -5 = 1 (a positive number); 6 + -7 = -1 (a negative number); 6 + -6 = 0 (zero). DON'T forget zero - it is a number

5.

How can an odd number always be made into an even number?

Add 2 to it

Subtract 2 from it

Divide it by 2

Multiply it by 2

Doubling an odd number will always produce an even number

6.

Which of the following statements is wrong?

If a number is a multiple of 8, it is divisible by both 2 and 4

If a number is divisible by 2, it is an even number

If a number is divisible by 2, it is divisible by 4

If a number is divisible by 4, it is divisible by 2

Not so, e.g. 2 × 9 = 18 BUT 18 is NOT divisible by 4. If you want to show that a statement is not always true, find one example that shows it is wrong - like we did here

7.

If a number is divisible by 5, what must the final digit of the number be?

0 or 5

5 only

0 only

1 only

For example, 130 (ends in zero) and 345 (ends in five) are both divisible by 5

8.

Which of the following is not a square number?

64

48

121

81

A square number is formed by multiplying another number with itself : 64 = 8 × 8; 121 = 11 × 11; 81 = 9 × 9. Note: 1 × 1 = 1

9.

What is meant by the following statement: 4 is a multiple of 48?

Four has to be multiplied 48 times with itself

Four is the square of 48

Four divides 48 exactly

Four does not divide 48 exactly

If a number is a multiple of another number, then it divides the other number exactly a certain number of times, e.g. 4 divides 48 exactly 12 times because 12 × 4 = 48. Note: 2.8 is a multiple of 16.8 because 2.8 × 6 = 16.8: so the idea of 'multiples' also applies to decimal numbers

10.

Which words do not describe the numbers 3, 5, 7 and 9?

Even numbers

Odd numbers

Whole numbers

Each number is two more than the previous number

They are all whole odd numbers, and each number is two more than then previous number