Page 21 - NUMINO TG_2A

01Unit Number of Squares

jOb ective Understand, read, and write hundreds.

1. Textbook Instructions Unit

Stimulate students’ interest in what they are 01 Number of Squares
going to learn in this unit by instructing them
to find ways to count the squares. Count the number of squares.
How many squares are there? 100.
How did you get 100? 100 squares
A1: I counted the squares one by one.
A2: I counted the squares in columns

separately, and added them up.

1

2 9

Figure 2 3 8 Figure 1
4 7
6
5 5
4
6 3
2
7 1 Chat

8 1+2+3+4+5+6+7+8+9=45

9

10 Find an easier way to count the number of squares by using
Figure 1 and Figure 2. Discuss it with your classmates.
1+2+3+4+5+6+7+8+9+10=55

How did you like counting squares one by What you need: Figure 1, 2 (A2)
one?
A1: It took a long time to count all the The 2 figures are put together to make a big square.
This square has 10 rows of 10 smaller squares in each row.
squares.
A2: 100 seemed like a big number.

Have students use Figures 1 and 2 in 2
Activity Sheet 2. Have them discuss and
explore better ways to count the squares.
After giving students plenty of time, show
them how Figures 1 and 2 can be put
together to make a perfect square. Count
10 squares in the first row. Then, add 10
tens to make 100.

2. Build Understanding

Make 100
Reinforce and extend students’ understanding of 100 using money, as they are most likely to be familiar with
the fact that 100 cents make 1 dollar. This will help them better understand the concept of 100.
10 dimes make 1 dollar. 100 cents make 1 dollar.

1 dollar 1 dollar = 10 dimes 1 dollar = 10 dimes = 100 cents
004 NUMINO Teacher s Guide