This document provides instructions and examples for multiplying two-digit numbers by one digit numbers mentally without paper and pencil. It shows the steps to take: 1) Multiply the ones, 2) Multiply the tens by the ones, 3) Add the partial products. Alternatively, use the distributive property to break the numbers into tens and ones. Practice problems are provided for students to multiply numbers mentally. Assessment questions test their ability to multiply various digit numbers without writing the calculations down. Additional enrichment problems apply mental math skills to real world scenarios.

2. Multiplying Mentally
2 –digits by 1 Digit
Numbers with Products
up to 200

3. Drill
64
x3
103
x 2
21
x 7
12
x 8
125
x 4

4. Citrus Plantation

5. motivation
* What can you see in the picture?
* Do you have fruit trees in your
backyard or farm?
*What benefits can you get from
these trees? Explain?

6. Developmental Activities
Mang Lito and his caretaker can
harvest 65 kilograms of kalamansi
In a day. How many kilograms of
kalamansi can they harvest in
3 days?

7. a. How many kilograms of kalamansi
can mang Lito and His caretaker
harvest in a day?
b. What is asked in the problem?
c. What is the number sentence? 3x65=n
d. How can we solve the problem
mentally.?

8. Solution 1
Preforming Activity
65
x 3
Multiply mentally the ones.
3x5=15
Multiply mentally the one
by tens
3x60=180
Add mentally:
15+180=195

9. Solution 2
65
x 3
By distributive property.
3x65=(3x60)+(3x5)
=180 +15
=195

10. How did you find the activity?
Processing the activities
How did you get the product without the
use of paper and pencil?
For Solution 1:
* We multiplied mentally the ones
* We multiplied mentally the tens by the ones
* We added mentally the two partial products
For Solution 2:
*We used the distributive property to solve
mentally.

11. A. Mentally give products of the following:
Reinforcing the concept and skill
84
x 2
65
x 3
42
x 4
24
x 7
15
x 8

12. How do you multiply mentally 2 digits by 1 digit
Numbers with products up to 200?
Summarizing the lesson
To multiply mentally 2-digits by 1 digit numbers
with products up to 200, follow the following
Steps:
Solution 1:
* Multiply the one
*Multiply the tens by the ones
*Add the two partial products
Solution 2:
* Use the distributive property.

13. Give the products of the following without
using paper and pencil.
Assessment:
65
x 2
57
x 3
32
x 5
15
x 8
23
x 6

14. Home activity
Give the products of the following:
75
x 2
57
x 4
32
x 3
15
x 6
23
x 7

15. Enrichment
Solve these problems mentally:
1. A piece of land was partially planted with
125 trees in 1 day. If it took 3 days for
Mang Juan and his workers to completely
finish the work, how many trees were planted
in all?
2. Liza can sew 5 dress in a day. How many
dresses can she sew in a month?