You’ve uploaded a worksheet titled
“Average of 3 Numbers”, which asks students to find the average (mean) of sets of three numbers.
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✔ How to Find the Average of 3 Numbers:
The
average (or
mean) is calculated by:
>
Sum of the numbers ÷ Number of values
Since each set has 3 numbers, the formula becomes:
>
(Number1 + Number2 + Number3) ÷ 3
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📝 Let’s solve each set step by step:
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#### Row 1:
-
4, 5, 6 → (4 + 5 + 6) = 15 → 15 ÷ 3 =
5
-
5, 9, 10 → (5 + 9 + 10) = 24 → 24 ÷ 3 =
8
-
8, 7, 6 → (8 + 7 + 6) = 21 → 21 ÷ 3 =
7
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#### Row 2:
-
10, 20, 30 → (10 + 20 + 30) = 60 → 60 ÷ 3 =
20
-
3, 10, 17 → (3 + 10 + 17) = 30 → 30 ÷ 3 =
10
-
8, 7, 6 → Already done above →
7
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#### Row 3:
-
12, 20, 1 → (12 + 20 + 1) = 33 → 33 ÷ 3 =
11
-
10, 5, 15 → (10 + 5 + 15) = 30 → 30 ÷ 3 =
10
-
15, 20, 25 → (15 + 20 + 25) = 60 → 60 ÷ 3 =
20
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#### Row 4:
-
18, 12, 6 → (18 + 12 + 6) = 36 → 36 ÷ 3 =
12
-
14, 6, 16 → (14 + 6 + 16) = 36 → 36 ÷ 3 =
12
-
15, 15, 12 → (15 + 15 + 12) = 42 → 42 ÷ 3 =
14
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#### Row 5:
-
2, 12, 22 → (2 + 12 + 22) = 36 → 36 ÷ 3 =
12
-
12, 18, 30 → (12 + 18 + 30) = 60 → 60 ÷ 3 =
20
-
20, 30, 40 → (20 + 30 + 40) = 90 → 90 ÷ 3 =
30
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#### Row 6:
-
16, 22, 32 → (16 + 22 + 32) = 70 → 70 ÷ 3 ≈
23.33 (or 23⅓)
-
17, 22, 21 → (17 + 22 + 21) = 60 → 60 ÷ 3 =
20
-
19, 21, 20 → (19 + 21 + 20) = 60 → 60 ÷ 3 =
20
> 💡 Note: For 16, 22, 32 — since 70 is not divisible by 3, you can leave it as a fraction (70/3) or decimal (23.33...). In elementary school, they may expect rounding or fractions.
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✔ Final Answers (by row):
Row 1:
5, 8, 7
Row 2:
20, 10, 7
Row 3:
11, 10, 20
Row 4:
12, 12, 14
Row 5:
12, 20, 30
Row 6:
23.33 (or 23⅓), 20, 20
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🎯 Teaching Tip:
This worksheet reinforces:
- Basic addition
- Division by 3
- Understanding of “average” as a central value
- Practice with whole numbers and possibly decimals/fractions
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Let me know if you’d like this formatted as an answer key for printing or want to see it in a table! 😊
Parent Tip: Review the logic above to help your child master the concept of averages worksheet.
