The number halfway between 18 and 22 can be found by taking the average of the two numbers. Adding 18 and 22 together gives us 40, and dividing by 2 gives us 20. Therefore, the number halfway between 18 and 22 is 20.
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Using the number line Start at '18' and move to the left, until you reach '-4' . You have made '22' steps ; the difference. Arithmetically 18 - - 4 = 18 + 4 = 22 The difference. Note the double negative.
18 = 16 + 2 = 1*24 + 0*23 + 0*22 + 1*21 + 0*20 = 100102.
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20,22,24,26,28, the 2 ten guys are technically all the things. Bro, 18 and 30 are not it because betwwwwwweeen 18 and 30. Don't include 9.
30