four
1 + 2 + 4 + 9 = 16
four numbers so divide 16 by 4
16/4 = 4 average
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2/9 / 1/2 = 4/9 or four ninths.2/9 divided by 1/2 = 2/9 x 2/1 = 4/9
9/2 (as opposed to 9 2) is 41/2.
9. Each 4 has 2 halves (2x4=8) plus the 1 half. Arithmetically, 4 1/2 = 9/2 9/2 divided by 1/2 = 9
4 1/2 - 9 = -4 1/2 (negative four and a half)
(9+ 4- 1 ) *2