This is level 5: identify prime numbers up to 144.
No
Yes
99
Whe a number appears
on the tree you have to decide
if it is a prime number then click the
Yes or the No button.


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Level 1  Pick prime numbers in the range 1 to 16
Level 2  Pick prime numbers in the range 17 to 37
Level 3  Pick prime numbers in the range 38 to 61
Level 4  Pick prime numbers in the range 62 to 99
Level 5  Identify prime numbers up to 144
More on this topic including lesson Starters, visual aids, investigations and selfmarking exercises.
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Currently the fastest time for this level (Level 5) has been achieved by Gourirupa with a time of 1:14 (that is 74 seconds) on Friday, April 26, 2019. Can you beat that? If you can make sure you claim a trophy because that is how fast times are officially recognised.
Gourirupa
1:14