Remember: A good yes or no question cuts the choices about in half, and each answer picks one branch of the question tree.
Read and answer
Read the story, then answer.
Guess the animalRavi and Bo played guess the animal at the picnic table. Six cards lay there: an owl, a parrot, a duck, a dog, a cat and a goldfish. Ravi hid one card, and Bo asked about each animal one at a time. After five whole questions, Bo knew it was the goldfish. Then Ravi showed a better way: ask a question that cuts the cards into two piles, like Does it have wings? Yes keeps the owl, the parrot and the duck, and no keeps the rest. In the next round the secret was the dog. A no to wings left three cards. Does it live in water? No left the dog and the cat. Does it say meow? No left only the dog. Three questions, not five.
1
Asking one card at a time, how many questions did Bo ask before he knew it was the goldfish?
365
2
Ravi asks Does it have wings? How many cards are in the yes pile?
316
3
Asking Is it the owl? cuts the six cards into two big piles.
TrueFalse
4
After Does it live in water? answered no, the dog and the were left.
catowlduck
5
The secret card is the cat. Following the three questions in the picture, which answers get there?
yes, no, yesno, no, nono, no, yes
Questions, order and fix
6
Put the dog round in order.
Does it have wings? No, three cards are left
Does it live in water? No, two cards are left
Six cards lie on the table
Does it say meow? No, only the dog is left
7
Join each idea to what it means.
1a question tree
2a good question
3each answer
4asking about one animal
Aa map of yes or no questions
Bchecks only one card
Ccuts the choices about in half
Dpicks one branch
8
Circle every question that splits the six cards into two piles.
🧸Does it have fur?🐈Is it the cat?🪶Does it have feathers?🐠Is it the goldfish?
9
A yes or no question can have three answers.
TrueFalse
10
Bo asks Is it the dog? and then Is it the cat? Ravi says there is a mix-up to fix. What is it?
He asked about one card at a time instead of cutting the cards into two pilesHe should not ask about animalsHe should ask three questions at once
11
Look at the picture. Which question took away the most cards?
Does it say meow?Does it live in water?Does it have wings?
12
Think of a secret object. Write two yes or no questions that would cut the choices down.
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Answer key · Set A
Ravi and the animal cards
15 He asked about five cards and each answer was no, so the goldfish was left.
23 Yes keeps the owl, the parrot and the duck. No keeps the dog, the cat and the goldfish.
3False That question checks only one card. A good question splits the cards about in half.
4cat A no to wings left the dog, the cat and the goldfish. A no to water took the goldfish away.
5no, no, yes The cat has no wings and does not live in water, but it does say meow. The answers no, no, no find the dog instead.
62, 3, 1, 4 Each question cuts the cards down: six, three, two, one.
71-A, 2-C, 3-D, 4-B A question tree maps the questions, and every answer picks one branch.
8Does it have fur?, Does it have feathers? Fur and feathers each sort the cards into two groups. Is it the cat and Is it the goldfish check only one card.
9True A yes or no question has only two answers, yes and no.
10He asked about one card at a time instead of cutting the cards into two piles One smart question can clear away a whole pile of cards.
11Does it have wings? The wings question went from 6 cards to 3, which took away 3. The water question took away 1, and so did the meow question.
12Your own words: a grown-up reads it.
Mark each answer, count the right ones and write the score on the sheet.