This document discusses multiples and using a hundreds chart to solve problems about callers winning prizes in a radio contest. It explains that the 6th caller would not win a prize because 6 is not a multiple of 3 or 7. The 14th caller would win a hat since 14 is a multiple of 7. A hundreds chart is used to circle the multiples of 3 for t-shirts and cross the multiples of 7 for hats. More callers will likely win t-shirts since there are more multiples of 3 than 7 in the lower numbers. Key learnings are that multiples are found by counting on by the given number and a common multiple is a number that is a multiple of two or more numbers.
2. Getting started
A local radio satiation held a call-in contest.
Every 3rd caller won a t-shirt
Every seventh caller won a baseball hat.
Suppose to were the sixth caller. Would you win prize? How
do you know?
Would you win a prize if you were the 14th caller? How do you
know?
3. Hundreds Chart
You can use the hundred chart to help solve the problem!
But how? – Draw on the board
Circle the 3’s and X the 7th caller
4. Explore
Why does the 21 have both colours on it?
Common multiple
Do you think more callers will winT-shirts or hats? Explain.
6. Key Math Learning
1)The multiples of a number can be found by starting at the
number and counting on by that number
2) A common multiple is a number that is a multiple of each
of two or more given numbers.
