
CHAPTER 2
GUESS THE RECORD!
INTRODUCTION
If you want to know the size of the biggest chewinggum bubble ever blown
or the age of the oldest person in the world, there is only one place
to gothe Guinness World Records Web site!
TASK
Using the Guinness World Records Web site, pick 2 world records that
you find interesting. The records can't just be any recordsthey must
meet the math conditions described below. Make up 4 math clues for each
record. A classmate will be using your clues to guess the numbers in your
records, so make them good!
MATERIALS
pencil and paper
PROCESS
Part A: Find Your Records
 Using a search engine, find the Guinness World Records Web site.
 Browse for facts that interest you on the Web site.
 Choose 2 records that interest you. Your records must meet these math
conditions:
 1 record must include a number higher than 10 000
 1 record must be a decimal tenth or a decimal hundredth
 Don't forget that someone else will be trying to guess the numbers
in your records so don't ruin the fun. Try to keep your records to yourself.
Part B: Make Up Clues
 For each of your records, write a question that will let your partner
know what record they are trying to guess. For example, "What is the
speed of the fastest train in kilometres per hour?"
 Create 4 clues for each record you chose. Your clues must involve
the following:
 rounding numbers
 describing the place value of digits in a number
 comparing numbers
Part C: Guess the Record
 Exchange questions and clues with a partner.
 Using your partner's clues, find the missing numbers for the records
they chose. Write your answers in standard form and words.
Part D: Check Your Answer
 Check with your partner to find out if you and your partner both guessed
the records correctly.
 Discuss how you could improve your clues.
 Make any necessary changes to your clues.
RESOURCES
Guinness World Records Web site
TASK
CHECKLIST 

Did
your records meet the math conditions? 

Did
your clues follow the math rules? 

Did
your clues lead to only one answer? 

Did
you use a variety of math words? 

Did
you include the right amount of detail? 

Did
you write answers to your partner's clues in both standard form
and words? 

