Page 27 - 新思维数学学生用书2 样章

Project 1: Possibly odd

Project 1 0 1 2 3 4 5 6 7 8 9

Possibly odd

Sofia and Marcus are playing a game.

They have two sets of 0 1 2 3 4 5 6 7 8 9

0−9 digit cards.

They spread one set face up so they can see all the digits.

They muddle up the cards in the second set and put them in

a pile face down. Marcus turns over the top card of the pile.

It is a 4. Marcus has to choose a face-up card to put with the 4.

This will make a two-digit number.

Which card should he choose to make the smallest possible odd

number? Why?

Try this for yourself with a partner.

• Set out two sets of 0−9 digit cards in the same way that Sofia

and Marcus did.

• Take it in turns to turn over the top card of the face-down pile

and decide which card from the face-up row will make the

smallest possible two-digit odd number with the card you’ve

turned over.

Talk with your partner about a good way of doing this each

time. Try it lots of times so that you are sure your way works

well. Can you explain your way to someone else?

How would your way of playing change if you had to make the

largest possible odd number?

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