The 60 second challenge involves adding numbers using theses rules:
• start with 0 points
• for every prime-numbered second, add 5 to your points total.
• for every second that is a factor of 60, add 2 to your points total
what should your points total be after 60 seconds?
show your workings.

Similar to all mental math calculations, you can improve your ability to add numbers by ... To understandusing the even and odd pattern, you may be familiar with the cheer that A second method is to break up the number that you are subtracting. To multiply any 2-digit number by 11 we just put the total of the two digits ...