Working with Whole Numbers

• 24

• 144

• 6

• 48

Answer explanation

Remember, the little 2 at the top means multiply by itself.

What is the lowest common multiple of 5 and 3?

Which of the following numbers are prime numbers? There is more than 1.

• 21

• 11

• 30

• 31

Find the answer using mental strategies. 163 - 19 = ?

32 x 21 = ?

Work out the answer in your workbook.

• 622

• 624

• 95

• 672

Add

34 + 2,109 + 456 + 145 =

Use working out space in your workbook.

• 2,744

• 2,514

• 3,462

• 2,474

What is the highest common factor of 36 and 48?