2007-08-30 21:04:30 · 17 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
ALWAYS remember to follow this in algebra:
P.lease E.xcuse M.y D.ear. A.unt S.ally, meaning:
Parentheses 1st,
Exponents 2nd,
Multiplication 3rd,
Division 4th,
Addition 5th,
Subtraction 6th
So, it's [(20)+5]*(20)=
25 * 20= 500
2007-08-30 21:36:52 · answer #1 · answered by Anonymous · 6⤊ 1⤋
ah, the most important rule you will have to learn in mathematics. The order of operation.
after this master the rest of arithmetic: addition (including subtraction), multiplication (including division, fractions, percents, decimals, exponents), and negative numbers (a times (-1) = (-a)). master these and you can handle anything.
work outside in with parentheses. Do multiplication/division before addition/subtraction if there are no parentheses in the way. You can't just march along from left to right doing each thing you come to as you come to it. Once you are reduced to the same type of operators, then it is left to right (or right to left) whatever you like.
[(16 + 4 ) + 5] x (11 + 9)
first is (16 + 4) = 20
[(20 ) + 5] x (11 + 9)
next [20 + 5] = 25
[25] x (11 + 9)
next (11 + 9) = 20
[25]x(20)
last 25x20 = 500
[(16 + 4 ) + 5] x (11 + 9) = 500
NOTE: without parentheses
16 + 4 + 5 x 11 + 9
first it is 5 x 11 = 55
16 + 4 + 55 +9
next add these in any order since they are all the same operator
16 + 4 + 55 +9 = 84
see, big difference (THIS IS NOT THE ANSWER)
[(16 + 4 ) + 5] x (11 + 9) = 500
2007-08-31 05:17:35 · answer #2 · answered by trogwolf 3 · 0⤊ 1⤋
25 x 20=500
2007-08-31 04:13:17 · answer #3 · answered by Fluxscion The Wicked 4 · 0⤊ 0⤋
[(16+4)+5]x(11+9)
=(20+5) x 20
=25 x 20
=500.
2007-08-31 07:56:49 · answer #4 · answered by Kenneth Koh 5 · 0⤊ 1⤋
25 x 20 = 500
2007-08-31 04:13:15 · answer #5 · answered by krysteven 4 · 0⤊ 1⤋
25 x 20 = 500
2007-08-31 05:01:15 · answer #6 · answered by Como 7 · 1⤊ 1⤋
Do the bracket first, from in to out:
calculation:
(20 +5) x (20)
= 25 x 20
=500
Simplify??
25 x (20)
=5 ^3 x 4
2007-08-31 04:15:48 · answer #7 · answered by ♂ smalcộộkies 2 · 0⤊ 1⤋
25*20=500
2007-08-31 05:43:35 · answer #8 · answered by Max 2 · 0⤊ 1⤋
[20+5] x (20) = 25 X 20 = 500
2007-08-31 04:13:09 · answer #9 · answered by ? 2 · 0⤊ 1⤋
16+4=20
20+5=25
11+9=20
25X20= 500
2007-08-31 04:13:25 · answer #10 · answered by smilies1998 3 · 0⤊ 0⤋
first you do the equation in the brackets...
So 16+4=20+5=25
Then you go on to the right bracket
11+9=20
And then you just multiply the two answers...
25+20=500
2007-08-31 04:27:35 · answer #11 · answered by Dariachu 3 · 0⤊ 0⤋