Problem-Solving Strategy
DRAWING A PICTURE
Drawing a picture can help solve a problem. A picture helps visualize a problem
and makes it easier to determine relevant facts and important relationships.
Example
It takes 5 minutes to saw through a log. How long will it take to cut the log into 10
pieces?
Solution
From the picture, you can see that you have to saw 9 times in order to cut the log
into 10 pieces.
So, 9 × 5 minutes = 45 minutes.
Exercises
Draw a picture on the space provided to solve each problem. Then write the
complete answer. Use the space provided.
1. A table can seat 4 persons. How many persons can sit on 4 such tables placed end
to end?
Complete answer: _________________________________________________________
2. There are two ducks before a duck, two ducks behind a duck, and a duck in the
middle of two ducks. If the ducks are arranged in a straight line, what is the least
number of ducks that can have this formation?
Complete answer: ______________________________________________________________
3. Five girls are in line waiting to buy at the school canteen. Nina is between Chloe
and Beatrice. Joyce is before Fiona. Beatrice is after Fiona. Arrange the girls from
first to last.
Complete answer: _____________________________________________________________
4. At the town plaza, 10 trees were planted on each side of the quadrangle. How
many trees were planted in all?
Complete answer: _____________________________________________________________
CHAPTER TEST
A. Write the place value of the underlined digit.
1. 35 963
______________
2. 134 490 ______________
3. 215 286 ______________
4. 406 913 ______________
5. 500 350 ______________
B. Write each number in standard form.
6. Sixty-four thousand, two hundred eleven
________________________
7. Four hundred fifteen thousand, two hundred ten
________________________
8. Two hundred fifty-five thousand, three hundred eight
________________________
C. Round each number to the place of the underlined digit. Write the rounded
number on the line.
7. 36 812
__________
8. 42 468
__________
9. 51 672
__________
10. 136 724 __________
11. 408 359 __________
12. 542 671 __________
D. Write the numbers in increasing order on the line.
13. 38 614;
21 785;
34 205;
40 163
______________________________________________________
14. 341 267;
314 236;
402 716;
291 426
______________________________________________________
15. 516 342;
615 815;
376 425;
354 976
______________________________________________________
E. Write the numbers in decreasing order on the line.
16. 12 016;
21 670;
10 491;
15 784;
20 675
______________________________________________________
17. 50 342;
58 796;
47 316; 53 917;
45 820
______________________________________________________
18. 314 682;
278 394;
167 815;
238 904;
218 428
______________________________________________________
F. Do what is asked.
1. Sorsogon City received 24 142 kilos of rice donations from private individuals.
About how many thousand kilos of rice were donated to the city?
______________________________________________________________________________
2. For one year, the district of Bacon in Sorsogon City planted 78 639 mahogany
seedlings. Estimate, in thousands, the mahogany seedlings planted.
______________________________________________________________________________
3. Read the situation and complete the table below
The Schools District of San Marcelino made a list of their district enrolment
from school year 2016-2017 to school year 2020-2021.
2016 - 2017 : 19 427
2017 - 2018 : 26 930
2018 - 2019 : 28 327
2019 - 2020 : 33 528
2020 - 2021 : 32 879
Copy and round off to the nearest thousands and ten thousands the school
population for each school year.