Lesson about the steps in Solving a Problem in Multiplication

1. Grade 2
Unit 2 Learning Packet 9
Problem Solving

2. Lesson Objective
1. Solve word problems involving
multiplication of whole numbers
including money.
2. Solve word problems involving
multiplication and addition or
subtraction of whole numbers
including money.

3. • Skip counting – is a method of
counting numbers by skipping them
with a certain number
• rows – a number of objects
arranged horizontally
• columns- vertical arrangement of
items
Vocabulary Bank

4. Marbles
Math Tale
Paolo has 4 bags of marbles.
Each bag has 3 marbles in it.
How many marbles does Paolo
have altogether?

5. Grade 2
Unit 2 Learning Packet 9
Problem Solving

6. Let’s Explore
Steps in solving a problem:
UNDERSTAND
PLAN
SOLVE

7. Let’s Explore
Let’s recall our steps in solving a problem.
STEP 1: UNDERSTAND
What is the problem
asking for?
What are the given
information?
The number of
marbles that Paolo
has.
Paolo has 4 bags of
marbles with 3
marbles each.

8. Let’s Explore
STEP 2: PLAN
marbles in
each bag
3
?
total number of marbles
Each bag has
3 marbles.
There are 4
groups of
3 marbles.
Each bar means 1 bag of marbles. 4 bags mean 4 bars.

9. Let’s Explore
To find the total number of marbles, we can add 3 four
times or multiply 4 and 3.
STEP 3: SOLVE
Adding 3 four times gives us 12.
Addition Sentence:
3 + 3 + 3 + 3 = 12 4 X 3 = 12
Multiplication Sentence:

10. Let’s Explore
We can also skip count by threes to multiply.
Skip counting
by
3s four times
also
gives us 12.

11. Let’s Explore
There are 4 groups of 3.
4 groups of 3 can
be shown by 4 rows
and 3 columns of
squares.
4 X 3 = 12

12. Let’s Explore
Let’s have another example.
A box has 5 cookies.
How many cookies are there
in 7 boxes?

13. Let’s Explore
Let’s follow the steps in solving a problem.
STEP 1: UNDERSTAND
What is the problem
asking for?
What are the given
information?
The total number of
cookies in 7 boxes.
There are 7 boxes of
cookies and each box
has 5 cookies.

14. Let’s Explore
STEP 2: PLAN
cookies in
each box
5
?
total number of cookies
Each bag has 5
cookies. There
are 7 groups of
5 cookies.
Each orange bar shows 1 box of cookies. Seven
boxes mean 7 bars.

15. Let’s Explore
We can add 5 seven times or multiply 7 and 5.
STEP 3: SOLVE
Adding 5 seven times gives us 35.
Addition Sentence:
5 + 5 + 5 + 5 + 5 + 5
+ 5 = 35 7 x 5 = 35
Multiplication Sentence:
Let’s multiply the two numbers.

16. Let’s Explore
We can also skip count by fives to multiply.
Skip counting by 5s seven times also
gives us 35.

17. Let’s Explore
7 groups of 5 can be
shown by 7 rows
and 5 columns of
squares.
7 x 5 = 35

18. Math Tale
Paolo has 4 bags of marbles.
Each bag has 3 marbles in it.
How many marbles does Paolo
have altogether? 12 marbles

19. Put to Practice
?
total number of flowers
flowers in each vase
There were 6 vases in a room. Each vase
had 4 flowers each. How many flowers were
there altogether?
4
6 4 24
X =

20. Put to Practice
?
total number of biscuits
biscuits in each pack
Tina, Tristan, Pam, and Paolo bought 4
packs of biscuits each. Each pack had 5
biscuits. How many biscuits did they have
altogether?
5
4 5 20
X =

21. Skill Builder
Draw Problem Solving Bars to solve the problems.
1. A pad of paper cost PhP 10 each. Miss Santos
bought 8 pads. How much did she pay in all?
? – amount of money she paid in all
10 pesos – cost of each pad
8 10
X 80
=

22. Skill Builder
Draw Problem Solving Bars to solve the problems.
2. Nadine baked 4 cakes each day. How many
cakes did she bake in 5 days?
? – total number of cakes
4 cakes
5 4
X 20
=

23. Skill Builder
Draw Problem Solving Bars to solve the problems.
3. The girls in the Grade 2 class made 6 groups. Each
group had 3 girls. How many girls were there in all?
? – total number of girls
3 girls
6 3
X 18
=

24. Keep in Mind
We have three steps to be followed in
problem solving:
1. Understand
2. Plan
3. Solve

25. Some collectors call
marbles by its Latin
word mibs.
Fun Fact

26. Grade 2
Unit 2 Learning Packet 9
Problem Solving

27. Thank You So
Much!