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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www.Transum.org/go/?Num=791
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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.
Answers to this exercise are available lower down this page when you are logged in to your Transum account. If you donâ€™t yet have a Transum subscription one can be very quickly set up if you are a teacher, tutor or parent.
Currently the fastest time for this level (Level 5) has been achieved by Solly123 with a time of 0:59 (that is 59 seconds) on Saturday, February 6, 2021. Can you beat that? If you can make sure you claim a trophy because that is how fast times are officially recognised.
Solly123
0:59