The result in a subtraction problem is the difference.
22 - 16 = 6
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The sum of 16+2=18, and half of that is 9, so the question would be 16 minus what equals 9. So, the answer would be 7.
The difference is 6.
7272 * * * * * WRONG! Sum from 23 to 123 = (sum from 1 to 123) minus (sum from 1 to 22) = 123*124/2 - 22*23/2 = 7626 - 253 = 7373. NOT 7272!
The product is 1254. The sum is 79.
30 plus 30 equals 60 and 60 minus 38 equals 22