#### You may also like ### Days and Dates

Investigate how you can work out what day of the week your birthday will be on next year, and the year after... ### Summing Consecutive Numbers

15 = 7 + 8 and 10 = 1 + 2 + 3 + 4. Can you say which numbers can be expressed as the sum of two or more consecutive integers? ### Paving Paths

How many different ways can I lay 10 paving slabs, each 2 foot by 1 foot, to make a path 2 foot wide and 10 foot long from my back door into my garden, without cutting any of the paving slabs?

# Shifting Times Tables

##### Age 11 to 14 Challenge Level:

The numbers in the four times table are
$$4, 8, 12, 16... 36, 40, 44... 100, 104, 108...$$
I could shift the four times table up by 3 and end up with
$$7, 11, 15, 19... 39, 43, 47... 103, 107, 111...$$
What do you notice about the differences between consecutive terms in each sequence?

The interactivity displays five numbers from a shifted times table.
On Levels 1 and 2 it will always display five consecutive terms from the shifted times table.
On Levels 3 and 4 it could display any five terms from the shifted times table.

Use the interactivity to generate some sets of five numbers.
Can you work out the times table and by how much it has been shifted?

Shifting Times Tables

 ? ? ? ? ?

Always enter the biggest times table it could be.
The shift is always less than the times table.

Table Shifted by

Once you are confident that you can work out the times table and the shift quite easily, here are some questions to consider:

What can you say if the numbers are all odd?
What about if they are all even?
Or a mixture of odd and even?

What can you say if the units digits are all identical?
What if there are only two different units digits?

What can you say if the difference between two numbers is prime?
What can you say if the difference between two numbers is composite (not prime)?

Can you explain how you worked out the table and shift each time, and why your method will always work?