2006-11-10 10:04:45 · 10 answers · asked by boscomycat 1 in Science & Mathematics ➔ Mathematics
55
2006-11-10 10:07:17 · answer #1 · answered by echinate 3 · 1⤊ 4⤋
20 + 40 + 3 - 8
= 60 + 3 - 8
= 63 - 8
= 55
2006-11-10 18:07:17 · answer #2 · answered by MsMath 7 · 1⤊ 2⤋
55
2006-11-10 18:08:37 · answer #3 · answered by emily 3 · 1⤊ 0⤋
55
2006-11-10 18:07:19 · answer #4 · answered by alanjb 1 · 1⤊ 0⤋
First, learn to use a calculator. Being able to use a calculator quickly and easily is an important skill. But you also want to be able to do simple math in your head.
To do in your head, try to group the numbers in a meaningful way. I would look at the first 2 numbers and instantly think "60" and look at the next 2 numbers and think "-5" and then the answer just naturally comes: "55"
2006-11-10 18:12:56 · answer #5 · answered by Tom Heston 2 · 1⤊ 0⤋
65
20+40 is 60
3-8 is negitive 5
so you would take the 60 and take away the negitive 5
60- -5 which would be 60+5 because two negitives make a positive. Its all order of operations, right to left!
2006-11-10 18:16:14 · answer #6 · answered by flying_babyb 2 · 1⤊ 0⤋
55.
2006-11-10 20:18:03 · answer #7 · answered by steiner1745 7 · 1⤊ 0⤋
you are kidding right 55
2006-11-10 18:52:58 · answer #8 · answered by Jose G D 2 · 1⤊ 0⤋
60+3-8
63-8
55
c'mon
2006-11-10 18:09:17 · answer #9 · answered by ceni40 3 · 1⤊ 2⤋
Answer is fifty-five....
2006-11-10 18:14:33 · answer #10 · answered by Amanda 3 · 1⤊ 0⤋