Real-life Life
Rounding Experience
By Dr. Alice C. Raganas
A
t first, I didn’t realize the importance
of rounding numbers, which our
Math teacher Mrs. dela Cruz
taught us one day. I learned how to
round whole numbers. In fact, I got
a perfect score in our formative test
after the discussion.
But still, I didn’t know the
importance of rounding whole
numbers. Until one day when I
realized that in real life, we often did
not need an exact numerical answer.
Usually a good approximation would
do.
One day, my mom gave me
P20.00. I was going to buy something
in the convenience store. I didn’t care
what the exact total bill would be. The
only thing I wanted to know was whether I would be spending more than
P20.00 or not. I also wanted to find out whether my money was enough to
buy the items from the grocery store.
The items I put in my basket cost the following: P2.50, P5.75, P1.25,
P1.85, P3.50, and P1.50. With these costs, I want to know if I have enough
money to pay for all these. To find out, I rounded each number to the nearest
peso, getting the following number of pesos: P3.00, P6.00, P1.00, P2.00,
P2.00, P4.00, and P2.00. Now, I could add these easily, getting P20.00. So
my P20.00 was more than enough to pay all the items I got.
MATH Talino Grade 3 Vol. 13 No. 1a
e-Pages
1
The following day, Mom, Dad and I had dinner at a restaurant. Mom
asked me to check the bill the waiter left on our table.
I told my mother that something was wrong with the computation of
the bill. She asked the waiter to recheck his computation. The waiter took
the bill. After a while, the waiter discovered that he wrote one and carried
three in the tens column instead of writing three and carrying one on the tens
column.
From then on, I realized the importance of rounding whole numbers
in real life. We can easily check whether the answers are correct or do they
make sense by rounding or approximation.
Rounding small whole numbers is as important as rounding greater
whole numbers. Just like when my parents bought a TV set in an appliance
store. The TV set cost P23 561. My father told the saleslady that he had P24
000 on hand. I knew that if I would round P23 561 to the nearest thousand, I
will get P24 000, because P23 561 was closer to P24 000 than P23 000. And
I was right. My mother said that my father’s money was enough to buy the
appliance.
The saleslady offered an appliance with a lesser price. It cost P23 453.
I thought my father would get the one that had a lower price.
If he did, he had more than enough money to buy the appliance
for P23 453. If I would round P23 453 to the nearest
thousand, it would be P23 000, because P23 453 is closer to
P23 000.
REMEMBER!
To round a number to any place, change
all digits to the right of that place to zero. Add
one to the digit in that place if the digit to its
right is five or more.
MATH Talino Grade 3 Vol. 13 No. 1a
e-Pages
2
Try This!
Part 1
Round each of the following to the nearest place indicated if
applicable.
Write NA if not applicable.
Nearest Tens
Nearest
Nearest
Hundreds
Thousands
1. 57
2. 387
3. 23
4. 192
5. 67 792
6. 5 908
7. 476
8. 5 485
9. 791
10. 32 549
11. 107
12. 3 732
13. 42 462
14. 87 724
15 94 521
Round to the nearest hundreds.
16. 567
17. 398
18. 8 476
19. 6 431
20. 8 080
Round to the nearest thousands.
21. 53 100
22. 64 954
23. 7 329
24. 75 198
25. 86 114
MATH Talino Grade 3 Vol. 13 No. 1a
e-Pages
3
Part 2
Round to the nearest tens.
1. 453
2. 439
3. 782
4. 384
5.
6.
7.
8.
Round to the nearest hundreds.
9. 369
13.
10. 537
14.
11. 454
15.
12. 382
16.
Round to the nearest thousands.
22.
17. 6 435
18. 6 935
23.
19. 7 548
24.
20. 7 832
25.
21. 2 104
624
453
685
845
1 369
6 932
3 458
7 251
5 395
28 631
54 352
18 365
Complete the table.
Number
63 539
54 830
94 698
31 745
29 482
32 591
82 364
Number Rounded to the Nearest
Hundreds
Thousands
Tens
MATH Talino Grade 3 Vol. 13 No. 1a
e-Pages
4
ANSWERS:
Part 1
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15
57
387
23
192
67 792
5 908
476
5 485
791
32 549
107
3 732
42 462
87 724
94 521
Nearest
Tens
60
390
20
190
67 790
5 910
480
5 490
790
32 550
110
3 730
42 460
87 720
94 520
16.
17.
18.
19.
20.
600
400
8 500
6 400
8 100
21.
22.
23.
24.
25.
53 000
65 000
7 000
75 000
86 000
Nearest
Hundreds
NA
400
NA
200
67 800
5 900
500
5 500
800
32 500
100
3 700
42 500
87 700
94 500
Nearest
Thousands
NA
NA
NA
NA
68 000
6 000
NA
5 000
NA
33 000
NA
4 000
42 000
88 000
95 000
MATH Talino Grade 3 Vol. 13 No. 1a
Part 2
1.
2.
3.
4.
9.
10.
11.
12.
17.
18.
19.
20.
21.
Number
63 539
54 830
94 698
31 745
29 482
32 591
82 364
450
440
780
380
5.
6.
7.
8.
620
450
690
850
400
500
500
400
13.
14.
15.
16.
1 400
6 900
3 500
7 300
6 000
7 000
8 000
8 000
2 000
22.
23.
24.
25.
5 000
29 000
54 000
18 000
Number Rounded to the Nearest
Tens
63 540
54 830
94 700
31 750
29 480
32 590
82 360
Hundreds
63 500
54 800
94 700
31 700
29 500
32 600
82 400
Thousands
64 000
55 000
95 000
32 000
29 000
33 000
82 000
e-Pages
5