Building blocks

What are the key features of a quadratic and what information do you need to be able to identify these for a particular example?

This problem is designed to be tackled in a team of four, working as two pairs. One of the pairs is trying to identify the quadratic on a randomly chosen card from this set of cards.

#### Instructions

• To begin, place all of the cards on the table and spend a couple of minutes familiarising yourselves with the types of images and equations that might be chosen.

• Next, one pair takes control of the cards, moving them out of sight from the other pair. They select a card at random. The other pair can now ask up to 8 “yes/no” questions to determine the hidden quadratic. It is important that each pair confers and agrees before asking or answering each question.

• You are permitted a maximum of two guesses at the hidden function, and each guess counts as one of your 8 questions.

#### Some things to consider

• Did you guess the quadratic correctly? If not, what additional information did you need?

• Did you make the most of the information you were given? Could you have avoided asking any of your questions?

• Were your questions clear? Did the other pair understand what you meant? Could you have used mathematical language to improve this?

• Would you ask the same questions next time?