*Due on Friday April 17
The following riddles come from a book called No Naked Numbers by Christine King. She gives
some suggestions for solving the riddles:
1) Use a guess and check problem solving strategy. Remember to record your guesses
2) Review and use the Table of Conversions
3) When possible, discuss your guesses, explaining why you thought specific values might work
4) Use a calculator. It’s not cheating.
5) If all else fails, look at the answers in the back of the book and work backwards to see how to
get from the answers to the number. Or have a friend look at the answer and give you clues.
Please use the following table of conversions chart to help you answer the riddles.
Seconds=1/2 minute
60 seconds= 1 minute
30 minutes 1/2 hour
60 minutes=1 hour
365 days= 1 year
52 weeks=1 year
6 months= 1/2 year
12 months=1 year
12 hours= 1/2 day
24 hours= 1 day
30 minutes=1/2 hour
60 minutes= 1 hour
10 years= 1 decade
100 years= 1 century
Riddle #1
Riddle #2
60+1=2
1+12=36
Riddle # 3
Riddle # 4
1+3=10
120+1=62
Riddle #5
Riddle +6
52-6=1/2
365+6=1.5
The answers will be on the following page:
Riddle #2
Riddle #1
1+12=36
60+1= 2
60 seconds +1 minutes=2 minutes
1 minutes +1 minutes= 2 minutes
1 day + 12 hours= 36 hours
24 hours + 12 hours= 36 hours
Riddle # 3
Riddle # 4
1 + 3 = 10
120+ 1=62
1 week + 3 days= 10 days
7 days + 3 days = 10 days
120 seconds + 1 hour = 62 minutes
2 minutes + 60 minutes= 62 minutes
Riddle #5
Riddle +6
52-6=1/2
365+ 6=1.5
52 weeks-6 months=1/2 year
1 year-1/2 year= ½ year
365 days + 6 months=1.5 years
1 year + 0.5 year=1.5 years
These are just a couple of questions from no naked numbers by Christine King. Check out the
book for more!
------------------------------------------------------------------------Math Challenge Confirmation:
Student Name: ___________________________________
Class: _______________________ Parent Signature: _________________________________
We have completed The Math Challenge for Week # 8!