![Number Detective](/sites/default/files/styles/medium/public/thumbnails/content-01-09-letme2-icon.gif?itok=uvYY5cb-)
![Five Steps to 50](/sites/default/files/styles/medium/public/thumbnails/content-id-10586-icon.jpg?itok=bm_mSNot)
problem
Five Steps to 50
Use five steps to count forwards or backwards in 1s or 10s to get to 50. What strategies did you use?
![Eightness of Eight](/sites/default/files/styles/medium/public/thumbnails/content-id-13704-icon.png?itok=M0Vg23eS)
problem
Eightness of Eight
What do you see as you watch this video? Can you create a similar video for the number 12?
![Digit Addition](/sites/default/files/styles/medium/public/thumbnails/content-id-14312-icon.png?itok=5rMz7AQJ)
problem
Digit Addition
Try out this number trick. What happens with different starting numbers? What do you notice?
![Ring a Ring of Numbers](/sites/default/files/styles/medium/public/thumbnails/content-id-2782-icon.png?itok=90NvaFQb)
problem
Ring a Ring of Numbers
Choose four of the numbers from 1 to 9 to put in the squares so that the differences between joined squares are odd.
![Light the Lights](/sites/default/files/styles/medium/public/thumbnails/content-id-7044-icon.gif?itok=Sei4jF0i)
problem
Light the Lights
Investigate which numbers make these lights come on. What is the smallest number you can find that lights up all the lights?
![More Numbers in the Ring](/sites/default/files/styles/medium/public/thumbnails/content-id-2783-icon.png?itok=E-Mrwln-)
problem
More Numbers in the Ring
If there are 3 squares in the ring, can you place three different numbers in them so that their differences are odd? Try with different numbers of squares around the ring. What do you notice?
![Consecutive Numbers](/sites/default/files/styles/medium/public/thumbnails/content-97-11-bbprob2-icon.jpg?itok=C_UREbsv)
problem
Consecutive Numbers
An investigation involving adding and subtracting sets of consecutive numbers. Lots to find out, lots to explore.
![Number Differences](/sites/default/files/styles/medium/public/thumbnails/content-id-2790-icon.jpg?itok=19is85tw)
problem
Number Differences
Place the numbers from 1 to 9 in the squares below so that the difference between joined squares is odd. How many different ways can you do this?
![Nice or Nasty](/sites/default/files/styles/medium/public/thumbnails/content-id-6605-icon.png?itok=mE0W1xSu)
problem
Nice or Nasty
There are nasty versions of this dice game but we'll start with the nice ones...
![Subtraction Surprise](/sites/default/files/styles/medium/public/thumbnails/content-id-11014-icon.png?itok=VAg2GirR)
![Tumbling Down](/sites/default/files/styles/medium/public/thumbnails/content-id-13728-icon.png?itok=ovhAwmmm)
![Three neighbours](/sites/default/files/styles/medium/public/thumbnails/content-id-8108-icon.gif?itok=eZEBmBsF)
![Curious number](/sites/default/files/styles/medium/public/thumbnails/content-id-7218-icon.png?itok=yakj4l75)
problem
Curious number
Can you order the digits from 1-3 to make a number which is divisible by 3 so when the last digit is removed it becomes a 2-figure number divisible by 2, and so on?