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example 4. Subtract 352014 from 714369 and check your answer.

Solution. Check:

L TTh Th H T O L TTh Th H T O

6 11 1

7 1 4 3 6 9 3 6 2 3 5 5
– 3 5 2 0 1 4 + 3 5 2 0 1 4

3 6 2 3 5 5 7 1 4 3 6 9

Tips

To check the subtraction, add the difference to the subtrahend
and see if the sum is equal to the minuend.

example 5. A factory produced 535798 toys in the year 2024 and 785995 toys in the

year 2025. Find the increase in the production of toys.

Solution. 8 18 15
Number of toys produced in 2025 = 7 8 5 9 9 5

Number of toys produced in 2024 = – 5 3 5 7 9 8
Increase in production of toys = 2 5 0 1 9 7

Thus, the increase in the production of toys in 2025 is 250197.

example 6. In an examination, 19543 students passed. Out of these, 3580 got an A

grade, 9500 got a B and the remaining got a C. How many students got a C grade?

Solution. 1 1

Number of students who got an A = 3 5 8 0
Number of students who got a B = + 9 5 0 0

Total number of students who got an A or a B = 1 3 0 8 0

4 14
Total number of students who passed the exam = 1 9 5 4 3

Number of students who got an A or a B = – 1 3 0 8 0
Number of students who got a C. = 0 6 4 6 3

Thus, 6463 students got a C grade.

36 Mathematics 5