Page 164 - NUMINO TG_3A

1099 0 ?? Unit

Objective: Learn how to multiply 2-digit numbers by 1-digit numbers Have students learn how to multiply the tens
by a 1-digit number.
Chat Example: 20 3
Explain how you drew the lines. Use model blocks to calculate 20 3.
The picture shows three groups of two tens.
Answers may vary. Have students discuss how they connected the You can calculate the tens using the following
numbers. They might have counted the blocks. Some might have multiplication sentence: 3 2 6
figured out the multiplication sentences. Therefore, 3 20 60.
You can simply calculate 20 3 in the
Learn how to multiply 20 by 3. following way.

3 2 tens 6 tens 20 20
3 3

60 60

The product of 2 3 is 6. You can simply add
a zero after the six.

Have students use the methods above to
solve the problems.

Multiply. 20 2 40 30 3 90
10 5 50 50 3 150 80 0 0
40 3 120

10. 99 0 = ?? 91

The Grid Paper

Have students learn how to multiply numbers by counting the number of squares in the rows and
columns. Have them use one unit square as 1 cm2. Students can also use this method to find the area of
a rectangle.

Example: 5 rows of 4 5 rows of 4

5 4 20

3A Unit 10 146