# Subtracting Large Numbers with Zero Difficulty I. Learning

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```					Subtracting Large Numbers with Zero Difficulty

I. Learning Objectives

Cognitive:           Subtract 5- or more digit numbers from 6- or more digit numbers with 3
continuous or non-continuous zeros in both the minuend and subtrahend with
regrouping
Psychomotor:         Solve for the difference of 6- or more digit numbers with zero difficulty
Affective:           Support organizations that help poor people

II. Learning Content

Skill:               Subtracting large numbers with zero difficulty
References:          BEC-PELC I.C.1.2.2 textbooks in Math 4
Materials:           flash cards, charts, pocket charts

III. Learning Experiences

A. Preparatory Activities

1. Drill

Subtract.
17       18        21       17       23       35       41        19
-10      -11      - 16     - 12     - 19     - 11     - 21      - 19

2. Review

Find the difference

3. Motivation

What government organizations help poor people? Have you experienced asking help
from some organizations?
B. Developmental Activities

1. Presentation

Red Cross is an organization which helps the poor people. During the Red Cross
Week, Garita Elementary School was given 12 000 tickets to sell for a benefit show. The
school was able to sell 9 032 tickets. How many tickets were not sold?

a. Who sells tickets?
b. Why do they sell tickets?

Valuing:

• As a student, how will you help this organization?
• Is it right to help them? Why?

Discussion

a. What is asked in the story problem?
b. What is/are given?
c. What is the word clue to determine the operation needed in the problem. What
operation are we going to use?
d. What is the number sentence for the problem?
When there are continuous zeros in the minuend, we rename and regroup, starting
at the left most digit.

9 9
1 10 10 10          1 10 10 10
12 000           12 0 0 0           12 0 0 0
- 9 032          - 9032             - 9032
2 968

2. Group Activity

Find the difference.
a.

b.
3. Generalization

How can you subtract numbers with 3 continuous or non-continuous zeros in both
minuends and subtrahends and with regrouping in any places?

When there are continuous zeros or non-continuous zeros, we regroup first in places that
need regrouping, starting at the leftmost digit, then proceed to subtraction.

C. Application

Find the difference.
1)    780 004        2)      2 357 000       3)     9 856 000    4)          900 603
- 36 842              -    26 453             - 500 032               - 590 407

5)     700 080       6)     7 800 000       7)    97 000 136    8)      160 080 000
- 345 000            - 1 156 000            - 6 002 179           - 42 165 000

IV. Evaluation

Find the difference.
1)         900 034         2)       867 000        3)        320 400
- 720 004                - 123 000                 - 10 009

4)     98 000 000         5)    65 000 000        6)     261 976 000
- 15 900 050              - 9 261 000             - 105 000 834

7)

6 000 537   - 1 485 000        =
-    153 000    -    290 007       =
-                  =

V. Assignment

Write in column and subtract.
1) 901 060 006 – 9 300 518 = n                             2) 100 000 000 – 85 643 214 = n
3) 80 000 000 – 1 234 567 = n                              4) 421 300 048 – 216 321 832 = n
5) 726 140 009 – 402 124 000 = n

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