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Primary 5 · Mathematics · Average

Average questions for Primary 5 Maths

10 questions to work through online. Answer and you get the working straight away, then a score at the end. No sign-up, and you can retake it as often as you like.

  • Finding an average
  • Working backwards
  • Adding a new value
  • Finding a missing value
  • Average of money
  • Reasoning about averages
  • Combined average
  • Average in context
0 of 10 answered
Question 1 of 10Finding an average
Find the average of 78, 85, 92, 65.
Question 2 of 10Working backwards
The average of 6 numbers is 45. What is their total?
Question 3 of 10Adding a new value
The average mass of 3 boxes is 62 kg. A fourth box of 78 kg is added. What is the average mass of the 4 boxes now?
Question 4 of 10Finding a missing value
The average of 4 numbers is 88. Three of them are 84, 84 and 84. What is the fourth number?
Question 5 of 10Average of money
Four friends spent an average of $12.50 each. How much did they spend altogether?
Question 6 of 10Finding an average
Over five days a cyclist rode 12 km, 15 km, 9 km, 14 km, 10 km. What was the average distance per day?
Question 7 of 10Reasoning about averages
The average of 5 numbers is 20. If each number is increased by 4, what is the new average?
Question 8 of 10Combined average
6 boys have an average mass of 35 kg and 4 girls have an average mass of 30 kg. What is the average mass of all 10 children?
Question 9 of 10Working backwards
Kumar scored an average of 76 marks in 4 tests. What must he score in a fifth test to raise his average to 80?
Question 10 of 10Average in context
A shop sold an average of 240 loaves a day over 3 days. On the first two days it sold 210 and 265 loaves. How many did it sell on the third day?
Answers and explanations for all 10 questions

Every answer with the reasoning behind it. Worth reading after you have tried the set — or on its own, if you are a parent marking it.

  1. Find the average of 78, 85, 92, 65.

    Answer: 80

    78 + 85 + 92 + 65 = 320, and 320 ÷ 4 = 80.

  2. The average of 6 numbers is 45. What is their total?

    Answer: 270

    Total = average × how many = 45 × 6 = 270.

  3. The average mass of 3 boxes is 62 kg. A fourth box of 78 kg is added. What is the average mass of the 4 boxes now?

    Answer: 66 kg

    3 × 62 = 186 kg, plus 78 kg is 264 kg, and 264 ÷ 4 = 66 kg.

  4. The average of 4 numbers is 88. Three of them are 84, 84 and 84. What is the fourth number?

    Answer: 100

    Total = 4 × 88 = 352. The three known numbers total 252, so the fourth is 352 − 252 = 100.

  5. Four friends spent an average of $12.50 each. How much did they spend altogether?

    Answer: $50.00

    4 × $12.50 = $50.00.

  6. Over five days a cyclist rode 12 km, 15 km, 9 km, 14 km, 10 km. What was the average distance per day?

    Answer: 12 km

    The total is 60 km, and 60 ÷ 5 = 12 km.

  7. The average of 5 numbers is 20. If each number is increased by 4, what is the new average?

    Answer: 24

    Adding 4 to every number adds 4 to the average, so it becomes 24.

  8. 6 boys have an average mass of 35 kg and 4 girls have an average mass of 30 kg. What is the average mass of all 10 children?

    Answer: 33 kg

    Boys: 6 × 35 = 210 kg. Girls: 4 × 30 = 120 kg. Together 330 kg ÷ 10 = 33 kg.

  9. Kumar scored an average of 76 marks in 4 tests. What must he score in a fifth test to raise his average to 80?

    Answer: 96

    He needs 5 × 80 = 400 marks in total and has 304, so the fifth test must score 400 − 304 = 96.

  10. A shop sold an average of 240 loaves a day over 3 days. On the first two days it sold 210 and 265 loaves. How many did it sell on the third day?

    Answer: 245

    Total = 3 × 240 = 720. Then 720 − 210 − 265 = 245.