To find the average of a set of numbers, you add all the numbers together and then divide by how many numbers there are.
Let’s go through each set one by one:
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Set 1: 78, 29, 120, 34, 59
Add them:
78 + 29 = 107
107 + 120 = 227
227 + 34 = 261
261 + 59 = 320
There are 5 numbers.
Average = 320 ÷ 5 =
64
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Set 2: 62, 56, 30, 50, 42
Add them:
62 + 56 = 118
118 + 30 = 148
148 + 50 = 198
198 + 42 = 240
5 numbers → 240 ÷ 5 =
48
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Set 3: 17, 55, 80, 67, 91
Add:
17 + 55 = 72
72 + 80 = 152
152 + 67 = 219
219 + 91 = 310
310 ÷ 5 =
62
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Set 4: 51, 19, 60, 22, 48
Add:
51 + 19 = 70
70 + 60 = 130
130 + 22 = 152
152 + 48 = 200
200 ÷ 5 =
40
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Set 5: 200, 71, 82, 125, 42
Add:
200 + 71 = 271
271 + 82 = 353
353 + 125 = 478
478 + 42 = 520
520 ÷ 5 =
104
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Set 6: 55, 52, 25, 150, 178
Add:
55 + 52 = 107
107 + 25 = 132
132 + 150 = 282
282 + 178 = 460
460 ÷ 5 =
92
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Set 7: 32, 47, 118, 71
Only 4 numbers here.
Add:
32 + 47 = 79
79 + 118 = 197
197 + 71 = 268
268 ÷ 4 =
67
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Set 8: 12, 79, 90, 85, 69
Add:
12 + 79 = 91
91 + 90 = 181
181 + 85 = 266
266 + 69 = 335
335 ÷ 5 =
67
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Set 9: 26, 28, 25, 24, 22
Add:
26 + 28 = 54
54 + 25 = 79
79 + 24 = 103
103 + 22 = 125
125 ÷ 5 =
25
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Set 10: 20, 24, 19, 25, 22
Add:
20 + 24 = 44
44 + 19 = 63
63 + 25 = 88
88 + 22 = 110
110 ÷ 5 =
22
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Set 11: 100, 50, 40, 30, 35
Add:
100 + 50 = 150
150 + 40 = 190
190 + 30 = 220
220 + 35 = 255
255 ÷ 5 =
51
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Set 12: 90, 110, 70, 130
Only 4 numbers.
Add:
90 + 110 = 200
200 + 70 = 270
270 + 130 = 400
400 ÷ 4 =
100
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Final Answer:
64, 48, 62, 40, 104, 92, 67, 67, 25, 22, 51, 100
Parent Tip: Review the logic above to help your child master the concept of math calculation worksheet.
