Let’s Compare
Unit
: 2D1 Pictograms (I)
Topic
: Let’s Compare
Key Stage : 1
Learning Objectives:
1. Arrange objects of the same type in line
2. Arrange three or more types of objects in lines by the method of one-to-one
correspondence and compare their quantities
Prerequisite Knowledge:
Arrange objects of the same type in groups
Teaching Resources:
1. Chess-men of Flying Chess
2. Abacuses
Arrange the chess-men
1. Each group of pupils receives the following number of chess-men: 4 red, 6
yellow and 7 green.
2. Pupils display the chess-men randomly on the table.
3. Each group arranges the chess-men in line and explains the method and
criteria they used.
4. Pupils discuss the benefit(s) of arranging the objects in line. (Easier to
differentiate the types of objects, tell the number of each type and compare
the difference in numbers)
Questions for Discussion:
1. Can you tell visually how many colours of chess-men are there?
2. Is it easy to tell the number of chess-men of each colour?
3. How to arrange the chess-men neatly? What are the criteria for grouping?
(size, shape, colour or types, etc)
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Let’s Compare
4. Which is an easier way to count the number of chess-men? Arrange the
chess-men in line or scatter them randomly on the table? Why?
Count the number of beads
1. Each group of pupils receives a pack of beads: 5 blue, 6 green and 8 yellow.
2. Pupils arrange the beads of each colour on the abacus in a line as shown in
the following figure:
3. Pupils explore by using the method of one-to-one correspondence to arrange
the beads in lines, count the number of beads and compare their differences
in number.
Questions for Discussion:
1. How many lines of beads can be arranged at most?
2. Which two colours of beads remain after the arrangement? How many beads
are left for each colour?
3. How many beads are there for each colour?
4. After the arrangement, how many more green beads than blue beads? How
many fewer blue beads then yellow beads?
5. After the arrangement, how many beads are there altogether?
6. Pupils think and discuss the method of counting the total number of beads.
(5+5+5+1+3=19)
Generic Skills Fostered:
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Collaboration Skills
Communication Skills
Critical Thinking Skills
Problem Solving Skills
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