If I have 1 2 3 4 = 7 What are the symbols + - * or /
My daughter's math puzzle.
2006-10-11 13:21:34 · 6 answers · asked by jshirey14 1 in Science & Mathematics ➔ Mathematics
The numbers have to stay in order of 1234 and when added,subtracted,multiplied or divided they have to equal 7.
2006-10-11 13:31:42 · update #1
Here's a few ways:
24 / 3 - 1 = 7
3 * 4 / 2 + 1 = 7
(4 - 1) * 3 - 2 = 7
(2 - 1) * 3 + 4 = 7
If they have to stay in order, here's a few ways:
(1 - 2) * -3 + 4 = 7
-(1 - 2) * 3 + 4 = 7
(-1 + 2) * 3 + 4 = 7
If you aren't allowed parentheses or leading signs then there are 64 ways to form this equation and none of them equate to 7...
1 * 2 * 3 * 4 = 24
1 * 2 * 3 / 4 = 1 1/2
1 * 2 * 3 + 4 = 10
1 * 2 * 3 - 4 = 2
1 * 2 / 3 * 4 = 2 2/3
1 * 2 / 3 / 4 = 1/6
1 * 2 / 3 + 4 = 4 2/3
1 * 2 / 3 - 4 = -3 1/3
1 * 2 + 3 * 4 = 14
1 * 2 + 3 / 4 = 2 3/4
1 * 2 + 3 + 4 = 9
1 * 2 + 3 - 4 = 1
1 * 2 - 3 * 4 = -10
1 * 2 - 3 / 4 = 1 1/4
1 * 2 - 3 + 4 = 3
1 * 2 - 3 - 4 = -5
1 / 2 * 3 * 4 = 24
1 / 2 * 3 / 4 = 1 1/2
1 / 2 * 3 + 4 = 10
1 / 2 * 3 - 4 = 2
1 / 2 / 3 * 4 = 2/3
1 / 2 / 3 / 4 = 1/24
1 / 2 / 3 + 4 = 4 1/6
1 / 2 / 3 - 4 = -3 5/6
1 / 2 + 3 * 4 = 12 1/2
1 / 2 + 3 / 4 = 1 1/4
1 / 2 + 3 + 4 = 7 1/2
1 / 2 + 3 - 4 = -1/2
1 / 2 - 3 * 4 = -11 1/2
1 / 2 - 3 / 4 = -1/4
1 / 2 - 3 + 4 = 1 1/2
1 / 2 - 3 - 4 = 6 1/2
1 + 2 * 3 * 4 = 25
1 + 2 * 3 / 4 = 2 1/2
1 + 2 * 3 + 4 = 11
1 + 2 * 3 - 4 = 3
1 + 2 / 3 * 4 = 3 2/3
1 + 2 / 3 / 4 = 2 1/6
1 + 2 / 3 + 4 = 5 2/3
1 + 2 / 3 - 4 = -2 1/3
1 + 2 + 3 * 4 = 15
1 + 2 + 3 / 4 = 3 3/4
1 + 2 + 3 + 4 = 10
1 + 2 + 3 - 4 = 2
1 + 2 - 3 * 4 = -9
1 + 2 - 3 / 4 = 2 1/4
1 + 2 - 3 + 4 = 4
1 + 2 - 3 - 4 = -4
1 - 2 * 3 * 4 = -23
1 - 2 * 3 / 4 = -1/2
1 - 2 * 3 + 4 = -1
1 - 2 * 3 - 4 = -9
1 - 2 / 3 * 4 = -1 2/3
1 - 2 / 3 / 4 = -5/6
1 - 2 / 3 + 4 = 4 1/3
1 - 2 / 3 - 4 = -3 2/3
1 - 2 + 3 * 4 = 11
1 - 2 + 3 / 4 = -1/4
1 - 2 + 3 + 4 = 6
1 - 2 + 3 - 4 = -2
1 - 2 - 3 * 4 = -13
1 - 2 - 3 / 4 = -1 3/4
1 - 2 - 3 + 4 = 0
1 - 2 - 3 - 4 = -8
By the way, if you get a chance, I'd like to know what your daughter's teacher gives as the "correct" answer.
2006-10-11 13:29:08 · answer #1 · answered by Puzzling 7 · 0⤊ 1⤋
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2016-10-19 05:50:51 · answer #2 · answered by ? 4 · 0⤊ 0⤋
(-1+2)*3+4=7
2006-10-11 14:00:48 · answer #3 · answered by safrodin 3 · 0⤊ 0⤋
3*(4-1)-2
= 3*3-2
= 9-2
7
!!!
hope this helps
2006-10-11 13:29:40 · answer #4 · answered by ilovemath_pi 2 · 0⤊ 0⤋
( (3x4) / 2 ) + 1 = 7
2006-10-11 13:32:55 · answer #5 · answered by Sergio__ 7 · 0⤊ 0⤋
i dont know im not smart...lol
2006-10-11 13:43:52 · answer #6 · answered by anna 2 · 0⤊ 1⤋