When you ask "What number is halfway between 42 and 660?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=42 and Y=660.
To find the number halfway between 42 and 660, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 42 and 660 into our formula, we get:
(42 + 660)/2 = 351
Thus, the number halfway between 42 and 660 is 351.
To check that our answer is correct, we subtract 42 from 351 and subtract 351 from 660 and compare the two numbers:
351 - 42 = 309
660 - 351 = 309
As you can see, the halfway number is 309 higher than 42 and 309 lower than 660. Therefore, our halfway between answer of 351 above is correct.
Halfway Between
Find halfway between two other numbers here!
Halfway Between 42 and 661
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