4
Review: halves and showing data
Learner’s Book 1: Units 11–14, pp. 156–220
GoalFind halves and read Venn diagrams, pictograms, tables and block graphs.
New words
half · one of two equal partspictogram · a chart that uses pictures to show how manymost / fewest · the biggest / the smallest number
Explanation
A half is one of two equal parts. When we cut a cake into two equal parts, each part is half. To find half of a number of things, share them into 2 equal groups. Half of 8 is 4. Venn diagrams, Carroll diagrams, pictograms, tables and block graphs show data. For each one, read the title and the key first. Then count, and use the words most, fewest, more and fewer.
Worked examples
Half of 10 apples: share them into 2 equal groups. Each group has 5 apples. Half of 10 is 5.
Birds in the park: Tuesday has the most, 5 birds. Wednesday has the fewest, 2 birds.
A block graph: the tallest column is the cats. 5 children chose cats and 3 chose dogs. 5 take away 3 is 2 more.
Class activity
Share and count: take 12 beans. Share them equally between you and a friend. How many each? Then ask 10 people what their favourite colour is and make a pictogram or block graph. Which colour has the most?
Practice
1
Two friends share a cake equally. What fraction of the cake does each get?
a half
2
What is half of 12?
6 (share 12 into 2 groups of 6)
3
How many more children chose pears than figs?
4 more (5 take away 1)
4
How many things are inside the circle?
3 (dog, table, hen)