1
Sorting inside a circle
Learner’s Book 1: Unit 14, pp. 203–207
GoalSort things with a Venn diagram: things that match the rule go inside the circle and the rest go outside.
New words
Venn diagram · a picture with a circle, used to sort thingsrule · what a thing must be to go inside the circleoutside · the place for things that do not match the rule
Explanation
To sort things, we need a rule. A rule is a few words, like ‘yellow things’. In a Venn diagram we draw a circle and write the rule on it. Things that match the rule go inside the circle. Things that do not match go outside the circle. Every thing must go somewhere. For each thing, ask: does it match the rule?
Worked examples
The rule is ‘yellow things’. A banana, a lemon and the sun are yellow, so they go inside the circle. A cherry, grass and the sea are not yellow, so they go outside.
The rule is ‘can fly’. A butterfly, an owl and a bee can fly, so they go inside. A cow and a fish cannot fly, so they go outside.
The rule is ‘you can eat it’. Count inside: 4 things. Count outside: 3 things. Altogether there are 4 and 3 more, which is 7 things.
Class activity
Hoop game: put a loop of string or a hoop on the floor. Pick a rule, such as ‘things that are blue’. Collect 8 things from the room and sort them: inside the loop or outside it. Can a friend guess your rule just by looking at what is inside?
Practice
1
Here is an empty circle. Which of these go inside: snail, cow, crab, hen, tortoise?
snail, crab and tortoise (they have a shell)
2
Which thing is in the wrong place?
The shoe. You cannot eat a shoe, so it must go outside.
3
How many things are outside the circle?
4 (sky, leaf, banana, grass)
4
Mia sorts her buttons. 4 red buttons go inside the circle and 3 other buttons go outside. How many buttons are there?
7 (4 and 3 make 7)