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MATH GRADE 2: Adding Numbers with Zero in any of the Addends with Regrouping
Adding Numbers with Zero in any of the Addends with Regrouping
I. Learning Objectives
Cognitive: Add 2 to 3 digit numbers with zero in any of the addends with regrouping with sums up to 999
Psychomotor: Play or explore manipulative devices
Affective: Show interest and enjoyment in group activities
II. Learning Content:
Skill: Add 2 to 3 digit numbers with zero in any of the addends with regrouping with sums up to 999
Reference: BEC PELC – I B3
Materials: stones/seeds/shells, flash cards: Basic addition facts; 2 to 3 digit addition facts with zeros with regrouping, place value compartment
Value: Cheerfulness
III. Learning Experiences
A. Preparatory Activities
1. DrillGame "How many?"
Prepare pairs of picture cards, each card ranging from 09. Example
Example:
Call on four pupils to come up front. Flash pairs of cards. The first one to give the correct total makes 1 step forward. Keep on showing pairs of picture cards until one has made 3 steps forward.
Call on another set of pupils and do the same. Continue the game until all pupils have had a turn.
(Onedigit number card can also be used alternatively with the picture cards) Be sure that the numbers do not require regrouping.
2. Review
Prepare number cards with 2 and 3 digit numbers.
Put a pocket chart on the board. Have the pupils get their pocketshowboard kit (consisting of a personal pocket chart and small number cards from 09). Tell them that they are going to get the sum of the numbers posted on the board. They will show their answers. Post two pairs of numbers and have them show their answers. (The numbers should not require regrouping.) Post from five to ten pairs.
3. Motivation
Act out this problem.
Tessie is helping mother beautify, their house. She picked some flowers from their garden and placed them in vases. She put 16 flowers in their big vase and 10 in their small vase.
B. Developmental Activities
1. Presentation
Ask: What is Tessie doing?
What did she pick? What did she do?
How many flowers were there in all?
Write the number sentence on the board. 16 + 10 = 26
* Discussion and Analysis
What do you think does mother feel with Tessie helping her?
What if Tessie put 34 flowers in the big vase or basket and 26 flowers in the small vase?
What will be the total number of flowers now? Ask for some guesses and list the
numbers given.
Have the pupils represent the numbers with tens and ones.
Show them that since 6 ones and 4 ones are equal to 10 ones. 10 ones can be replaced
with 1 tens.
Emphasize the use of the term regrouping.
How many tens are there now?
What is 26 + 14? Write the equation.
Give other sets of numbers for practice.
Use 2digit numbers, 3digit numbers, and combination of the two.
Present: 408 + 129 = ____
Show the place value compartments and stones?seeds/shells.
Let pupils place the counters (precounted and prepacked) in the place value compartments following the number sentence presented and written on the board.
Ask a pupil to get the 8 ones and the 9 ones.
 How many ones are there in all?
 Should we place all the 17 ones in the ones compartment?
 How many excess ones are there?
Show and explain to them where the stones are to be regrouped and why.

H
T
O
4
0
8
1
2
9
 How many tens are there in the upper TENS compartment? (Zero)

If we put the excess 10 ones in this empty top most TENS compartment, what would be the answer? Add them to the 20 counters in the middle TENS compartment. How many in all? Place them in the lower TENS compartment?
 What if the middle Ten compartment was empty, and the 20 counters were in the upper TENS compartment, will the answer change? Why?
(Do the same with the HUNDREDS compartment)

Group Activities
Activity 1
a. Designate places for the HUNDREDS, TENS and ONES in the classroom.
b. Call on pupils to represent the hundreds, tens and ones in the number sentence discussed using counters.
c. Let the rest of the class read the digits to be added:
8 + 9 =
d. The pupils acting as counters in the 2^{d} addend join the ONES pupils in the 1^{st}^{ }addend.
e. The rest of the class says "Regroup" when the union's result is more than 10.
f. These 10 ones go near the TENS place
g. The rest of the class says "0 + 10 = "
h. Only then when the ten ones enters the TENS place.
i. The rest of the class says "4 + 1 = "
j. Pupils assigned as hundred join together in the HUNDREDS place.
 What is 408+129?
 Let us read our human counters.
k. Present other addition numbers.
l. Let other pupils act as counters.
Activity 2
a. Group the class into 3.
b. Each group assigns a leader.
c. Each group has to think of a 3digit addition combinations with 0 in one of the addends with regrouping.
d. Each group will group the counters they brought (an assignment the day before) according to the addition combinations they made.
e. Each group leader presents the output the way the teacher did.
Valuing:
 How did you feel while doing the activities?
 Were you happy? Were you interested in what your group was doing?
3. Generalization
What do you mean by "regrouping"?
How do you add numbers with regrouping?
C. Application
Let them do the following exercise in their notebook.

1)
107
2)
208
3)
107
4)
187
5)
206
+83
+25
+268
+105
+ 236
IV. Evaluation
Find the sum.

1)
506
2)
804
3)
909
4)
274
5)
482
+345
+57
+68
+107
+ 109
V. Assignment
What is their sum?
1) 206 + 266 =
2) 85 + 308 =
3) 204 + 518 =
4) 406 + 255 =
5) 405 + 287 =

6)
25
30
7)
74
20
8)
90
37
9)
80
64
10)
40
39
+68
+49
+15
+56
+ 61
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