What are the factors of 40?

Answer 1

The factors are #1#, #2#, #4#, #5#, #8#, #10#, #20#, #40#

I find factors in pairs, It will look like more work than it is, because I will explain how I am doing these steps. I do most of the work without writing it down. I'll put the explanation in black in [brackets] and the answer in #color(blue)"blue"#.
I'll proceed by starting with #1# on the left and checking each number in order until either I get to a number already on the right or I get to a number greater than the square root of 40.
#color(blue)(1 xx 40)#

[I divide 40 by 2 because I can see that it is divisible by 2; this gives me the next pair.]

#color(blue)(2 xx 20)#

[At this point, we're checking 3. However, 40 is not divisible by 3. I usually write a number before checking, so I cross out any values that aren't factors.]]

#color(blue)cancel(3)#
[Now we need to check 4. Up above, we got #40 = 2xx20# since #20 = 2xx10#, we see that #40 = 2xx2xx10 = 4xx10#]
#color(blue)(4 xx 10)#
[The next number to check is 5. We can either divide #40 -: 5# to get #8# or split up the #10# in the last factor pair: #40 = 4xx10 = 4xx2xx5=8xx5#]
#color(blue)(5xx8)#

Proceed to 6. However, 40 cannot be divided by 6; 6 is not a factor of 40.

#color(blue)cancel(6)#

[40 cannot be divided by 7]

#color(blue)cancel(7)#
The next number, #8#, already appears on the list above (on the right). For numbers greater than #8# to be factors of #40# they would have to be multiplied by something less than the #5# we use in #8xx5=40#. We've already checked the smaller numbers, so we're done.
The factors are #1#, #2#, #4#, #5#, #8#, #10#, #20#, #40#
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Answer 2

The factors of 40 are: 1, 2, 4, 5, 8, 10, 20, and 40.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

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