Primary 5 Mathematics Addition Subtraction Quiz

Primary 5 Mathematics Quiz - Addition Subtraction: Answer Key

Total Marks: 40

Section A: Multiple-Choice Questions (10 marks)

1. B) 689 838

• Marks: 2
• Working: 458 291 + 231 547 = 689 838
• Explanation: Add the numbers column by column, starting from the ones place. 1 + 7 = 8 (ones), 9 + 4 = 13 (tens, carry 1), 2 + 5 + 1 = 8 (hundreds), 8 + 1 = 9 (thousands), 5 + 3 = 8 (ten thousands), 4 + 2 = 6 (hundred thousands).
• Common mistake: Students may forget to carry over the 1 from the tens place, leading to answer A (689 738).

2. B) 175 000

• Marks: 2
• Working: 1 250 000 – 1 075 000 = 175 000
• Explanation: "How many more" means we subtract the smaller number from the larger number. 1 250 000 – 1 075 000 = 175 000.
• Common mistake: Students may add instead of subtract, getting 2 325 000.

3. A) 3 654 322

• Marks: 2
• Working: 6 000 000 – 2 345 678 = 3 654 322
• Explanation: Subtract column by column, borrowing where needed. 6 000 000 – 2 345 678 = 3 654 322.
• Common mistake: Students may forget to borrow correctly across multiple zeros.

4. B) 159

• Marks: 2
• Working: 127 + 98 = 225 pages read. 384 – 225 = 159 pages left.
• Explanation: First, find the total number of pages read by adding 127 and 98. Then, subtract the total pages read from the total pages in the book.
• Common mistake: Students may subtract only one day's reading instead of both.

5. A) 45 000 + 32 000

• Marks: 2
• Working: A) 45 000 + 32 000 = 77 000. B) 80 000 – 12 000 = 68 000. C) 25 000 + 28 000 = 53 000. D) 70 000 – 15 000 = 55 000. The largest is 77 000.
• Explanation: Calculate each option and compare the results.
• Common mistake: Students may guess without calculating all options.

Section B: Short-Answer Questions (15 marks)

6. 3 580 245

• Marks: 2
• Working: 2 345 678 + 1 234 567 = 3 580 245
• Explanation: Add the numbers column by column, carrying over when the sum in a column is 10 or more.
• Marking note: Award 1 mark for correct method with minor error, 2 marks for correct answer.

7. 2 012 346

• Marks: 2
• Working: 3 000 000 – 987 654 = 2 012 346
• Explanation: Subtract column by column, borrowing from the next higher place value when needed.
• Marking note: Award 1 mark for correct method with minor error, 2 marks for correct answer.

8. 543 211

• Marks: 2
• Working: 1 000 000 – 456 789 = 543 211
• Explanation: To find the number to be added, subtract the given number from the target sum.
• Marking note: Award 1 mark for correct method with minor error, 2 marks for correct answer.

9. $2 875 000

• Marks: 2
• Working: $1 250 000 +$875 000 = $2 125 000 (total spent).$5 000 000 – $2 125 000 =$2 875 000.
• Explanation: First, find the total amount spent by adding the two expenses. Then, subtract the total spent from the initial amount.
• Marking note: Award 1 mark for correct method with minor error, 2 marks for correct answer.

10. 4 750 000

• Marks: 2
• Working: 8 500 000 – 3 750 000 = 4 750 000
• Explanation: To find the other number, subtract the given number from the sum.
• Marking note: Award 1 mark for correct method with minor error, 2 marks for correct answer.

11. 900 000 kg

• Marks: 2
• Working: 2 350 000 – 1 450 000 = 900 000
• Explanation: "How much more" means we subtract the smaller amount from the larger amount.
• Marking note: Award 1 mark for correct method with minor error, 2 marks for correct answer. Include unit (kg) for full marks.

12. 2 550 000 books

• Marks: 2
• Working: 2 500 000 + 125 000 = 2 625 000 (after buying). 2 625 000 – 75 000 = 2 550 000 (after removing).
• Explanation: First, add the new books. Then, subtract the old books that were removed.
• Marking note: Award 1 mark for correct method with minor error, 2 marks for correct answer. Include unit (books) for full marks.

13. 5 000 000 bottles

• Marks: 3
• Working: 1 250 000 + 1 500 000 = 2 750 000 (March + April). 2 750 000 + 2 250 000 = 5 000 000 (total).
• Explanation: Add the sales for all three months together.
• Marking note: Award 1 mark for each correct addition step, 1 mark for final answer. Include unit (bottles) for full marks.

14. 300 students

• Marks: 3
• Working: 1 800 – 1 050 = 750 (upper primary students). 1 050 – 750 = 300 (difference).
• Explanation: First, find the number of upper primary students by subtracting the lower primary students from the total. Then, find how many more lower primary students there are by subtracting the upper primary number from the lower primary number.
• Marking note: Award 1 mark for finding upper primary number, 1 mark for finding the difference, 1 mark for correct answer. Include unit (students) for full marks.

Section C: Problem-Solving Questions (15 marks)

15. $1 350 000

• Marks: 3
• Working: $1 200 000 +$950 000 = $2 150 000 (total spent).$3 500 000 – $2 150 000 =$1 350 000.
• Explanation: First, find the total amount spent by adding the cost of equipment and salaries. Then, subtract the total spent from the initial amount.
• Marking note: Award 1 mark for correct addition, 1 mark for correct subtraction, 1 mark for correct answer with unit.

16. 450 000 chickens

• Marks: 3
• Working: 1 200 000 + 850 000 = 2 050 000 (total sold). 2 500 000 – 2 050 000 = 450 000.
• Explanation: First, find the total number of chickens sold by adding the amounts for both markets. Then, subtract the total sold from the initial number.
• Marking note: Award 1 mark for correct addition, 1 mark for correct subtraction, 1 mark for correct answer with unit.

17. 500 000 pencils

• Marks: 3
• Working: 2 250 000 – 1 750 000 = 500 000
• Explanation: "How many more" means we subtract the smaller number from the larger number.
• Marking note: Award 1 mark for correct method, 1 mark for correct subtraction, 1 mark for correct answer with unit.

18. $450 000

• Marks: 3
• Working: $850 000 +$1 200 000 = $2 050 000 (total spent).$2 500 000 – $2 050 000 =$450 000.
• Explanation: First, find the total amount spent by adding the cost of computers and library books. Then, subtract the total spent from the amount raised.
• Marking note: Award 1 mark for correct addition, 1 mark for correct subtraction, 1 mark for correct answer with unit.

19. 875 000 kg

• Marks: 4
• Working: 1 250 000 + 1 500 000 = 2 750 000 (Shop A + Shop B). 2 750 000 + 875 000 = 3 625 000 (total sent). 4 500 000 – 3 625 000 = 875 000.
• Explanation: First, add the amounts sent to Shop A and Shop B. Then, add the amount sent to Shop C to find the total amount sent. Finally, subtract the total sent from the initial amount.
• Marking note: Award 1 mark for each correct addition step, 1 mark for correct subtraction, 1 mark for correct answer with unit.

20. $8 200 000

• Marks: 5
• Working: First half: $8 000 000 +$2 500 000 = $10 500 000 (after earnings).$10 500 000 – $3 200 000 =$7 300 000 (after spending). Second half: $7 300 000 +$3 800 000 = $11 100 000 (after earnings).$11 100 000 – $2 900 000 =$8 200 000 (final amount).
• Explanation: Work through the problem step by step. For each half of the year, first add the earnings, then subtract the spending. Continue with the next half using the new amount.
• Marking note: Award 1 mark for each correct step (4 steps), 1 mark for correct final answer with unit. Accept alternative correct methods.