Let’s solve each set of numbers by finding the average (also called the mean).
To find the average:
→ Add all the numbers together.
→ Then divide that total by how many numbers there are.
We’ll go row by row, left to right.
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First row, left: 47, 25, 90, 38, 50
Add them: 47 + 25 = 72; 72 + 90 = 162; 162 + 38 = 200; 200 + 50 =
250
There are 5 numbers → 250 ÷ 5 =
50
First row, right: 12, 26, 10, 20, 27
Add them: 12 + 26 = 38; 38 + 10 = 48; 48 + 20 = 68; 68 + 27 =
95
5 numbers → 95 ÷ 5 =
19
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Second row, left: 13, 35, 40, 45, 67
Add: 13 + 35 = 48; 48 + 40 = 88; 88 + 45 = 133; 133 + 67 =
200
5 numbers → 200 ÷ 5 =
40
Second row, right: 11, 29, 20, 47, 38
Add: 11 + 29 = 40; 40 + 20 = 60; 60 + 47 = 107; 107 + 38 =
145
5 numbers → 145 ÷ 5 =
29
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Third row, left: 100, 75, 80, 120, 35
Add: 100 + 75 = 175; 175 + 80 = 255; 255 + 120 = 375; 375 + 35 =
410
5 numbers → 410 ÷ 5 =
82
Third row, right: 25, 50, 75, 100, 125
Add: 25 + 50 = 75; 75 + 75 = 150; 150 + 100 = 250; 250 + 125 =
375
5 numbers → 375 ÷ 5 =
75
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Fourth row, left: 33, 48, 120, 59
Wait — this one has only 4 numbers! Let’s check again: 33, 48, 120, 59 → yes, 4 numbers.
Add: 33 + 48 = 81; 81 + 120 = 201; 201 + 59 =
260
4 numbers → 260 ÷ 4 =
65
Fourth row, right: 3, 99, 50, 35, 38
Add: 3 + 99 = 102; 102 + 50 = 152; 152 + 35 = 187; 187 + 38 =
225
5 numbers → 225 ÷ 5 =
45
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Fifth row, left: 77, 78, 79, 76, 75
Add: 77 + 78 = 155; 155 + 79 = 234; 234 + 76 = 310; 310 + 75 =
385
5 numbers → 385 ÷ 5 =
77
Fifth row, right: 30, 31, 33, 31, 30
Add: 30 + 31 = 61; 61 + 33 = 94; 94 + 31 = 125; 125 + 30 =
155
5 numbers → 155 ÷ 5 =
31
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Sixth row, left: 103, 97, 100, 98, 99
Add: 103 + 97 = 200; 200 + 100 = 300; 300 + 98 = 398; 398 + 99 =
497
5 numbers → 497 ÷ 5 =
99.4
Sixth row, right: 12, 188, 70, 130
Only 4 numbers here!
Add: 12 + 188 = 200; 200 + 70 = 270; 270 + 130 =
400
4 numbers → 400 ÷ 4 =
100
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Final Answer:
Left column averages: 50, 40, 82, 65, 77, 99.4
Right column averages: 19, 29, 75, 45, 31, 100
Parent Tip: Review the logic above to help your child master the concept of averages worksheet.
