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Counting in 50s is very similar to your 5 times table.

Let's count in 5s:

5, 10, 15, 20, 25, 30 …

Now let's count in 50s:

50, 100, 150, 200, 250, 300 …

What do you notice?

Counting in 50s is just like counting in 5s but with an extra zero. This is because the numbers are ten times bigger.

What numbers are missing from this sequence?

300, … , 400, 450, …

Use your knowledge of the 5 times table and reduce the size of each number by dividing by 10.

That sequence would go:

30, 35, 40, 45, 50

Now multiply the numbers by 10 again to find the answer.

300, 350, 400, 450, 500

The missing numbers are 350 and 500.

There are 50 chocolates in each box. Maja ordered 7 boxes.

How many chocolates are there in total?

Use a number line to find 7 lots of 50:

There are 350 chocolates in 7 boxes.

Another way you could have worked this out is by using your 5 times table knowledge.

If 5 x 7 = 35, then 50 x 7 = 350, because when you count in multiples of 50, it is 10 times greater than counting in multiples of 5.

Which number in this sequence is the odd one out?

700, 650, 600, 555, 500, 450

What do you know about multiples of 50?

• They’re very similar to the 5 times table, but 10 times greater.

• They end in a zero.

Which of these numbers don’t follow those rules?

555 looks very similar to 55 which is a multiple of 5, but it doesn’t end in a zero.

So 555 is the odd one out.