Question

Solve the problem, expressing your answer using the correct number of significant.
75.6*12.33

Answer 1

75.6 x 12.33 = 932.148

I hope this helps but im not exactly sure

Answer 2

assuming the math in the above post is right, the final answer is 932, as you should use 3 significant figures for the final answer

Answer 3

i just need to multiply them?

Answer 4

yes, multiply them...the number of significant figures in the final answer will be the same as the number of significant figures in the least precise term (the term with the fewest significant figures)

Answer 5

75.6 has 3, 12.33 has 4, so final answer has 3 significant figures

Answer 6

okay so for this one 31.5+124.6-23.199
equals= 132.901?

Answer 7

how do i find the significant fig?

Answer 8

31.5 has 3, 124.6 has 4, 23.199 has 5
significant figures are non-zero digits and also zeros between non-zero digits

Answer 9

okay, if it equals 132.901?

Answer 10

is it 3 significant fig?

Answer 11

im sorry, i was wrong earlier. you're looking for the decimal places, not significant figures. so in the first answer you'd want 1 decimal place, second answer you'd also want 1 decimal place

Answer 12

wait im so lost now :( lol

Answer 13

ok i lost you even further because i was right in the first one

Answer 14

whaaaaaaat! lol

Answer 15

in multiplication, you want the same number of significant digits. in addition, you want the same number of decimal places

Answer 16

wait, we're doing significant figures right? lol

Answer 17

yes, in multiplication, the answer has the same number of significant figures as the least accurate measure. in addition, answer has same number of decimal places, not significant figures

Answer 18

im sooooooo lost lmfao, but okay :l

Answer 19

so it equals 132.901 then what do i do?

Answer 20

so 75.6*12.33, answer has 3 significant figures
31.5+124.6-23.199, answer has 1 **decimal place**

Answer 21

but i do have to add & subtract it right?

Answer 22

of course

Answer 23

so it stays as 132.901?

Answer 24

you only want 1 decimal place, so 132.9

Answer 25

http://www.wellesley.edu/Astronomy/kmcleod/Toolkit/sigfigs.html

Answer 26

i dont understand this :|

Answer 27

you don't understand significant figures in general or how to determine how many a product or result of addition have?

Answer 28

how to determine how many a product or result of addiction have!!!!!

Answer 29

:(

Answer 30

75.6*12.33
how many significant figures are in 75.6 and 12.33?

Answer 31

75.6 has 3 and 12.33 has 4 right?

Answer 32

right

Answer 33

so, in multiplication, the answer has to have the same number of SF as the term with the least number of SF

Answer 34

because 3 is less than 4, answer has 3 SF

Answer 35

okay, what about for adding & subtracting?

Answer 36

ignore the SF, count the decimal places

Answer 37

so the one with the least decimals?

Answer 38

right

Answer 39

so it will be one decimal right?

Answer 40

yes

Answer 41

okay so if the answer was 132.901 how do i know which number to take out?

Answer 42

how many decimal places do you need?

Answer 43

1?

Answer 44

how many do you have?

Answer 45

3

Answer 46

?????

Answer 47

yes, so what do you do?

Answer 48

lol, i dont know what to do :( lmfao
i would say just subract 1 and take off 2? lol

Answer 49

you round to the nearest tenth
132.901 is approximately 132.9

Answer 50

if your answer was 132.999, you'd round to 133.0

Answer 51

OHHHHHHHHHHHHHHH! lol lol

Answer 52

assuming you wanted 1 decimal place

Answer 53

GOT IT! okay can you help me with another? ima try to do it first and tell me if im right or wrong?

Answer 54

ok

Answer 55

wait what about when dividing?

Answer 56

o:

Answer 57

dividing is the same as multiplying by the reciprocal, so same rules

Answer 58

okay so for
2+4.5+23.52

Answer 59

2=1
4.5=2
23.52=4
right?

Answer 60

so i have to go for the one that has the least SF, which is one correct? o:

Answer 61

yeah, thats how many SF each has, but you ignore SF for addition/subtraction

Answer 62

omg what? lol ima get lost again :(


well i got 30.02 o:

Answer 63

how many decimal places does 2 have?

Answer 64

2?

Answer 65

the number 2?

Answer 66

it has no decimal places

Answer 67

omg this is sooo confusing!!! lmfao
what do you mean it doesnt?

Answer 68

EXPLAIN PLZ

Answer 69

a decimal place isn't the same thing as a significant figure
for example the number 50.24589 has 7 significant figures, but 5 decimal places

Answer 70

5 decimals becuz its after the decimal right?

Answer 71

yeah, there is no decimal in the number 2, so there are no decimal places

Answer 72

so if using it in addition accounting for SF, your answer should have no decimal places

Answer 73

wait thats where im confused, because you said 50.24589 has 5 decimal places
but for 30.02, doesnt it have 2 decimal places?

Answer 74

yes, i was using that number as an example

Answer 75

i know, omg im getting really confused! okay 50.245989 right? why does it have 5 decimal places? bceuz after the decimal it has 5 number right?

Answer 76

yes

Answer 77

okay so for 30.02, after the decimal it has 2 numbers doesnt it? thats where im gettng confused

Answer 78

yes it has 2, that is the answer to the addition you wanted, but you have to get rid of the decimal places by rounding to the nearest whole number because you don't want any decimal places in your answer

Answer 79

okay, so it will be just 30? o:

Answer 80

right

Answer 81

so then it will have 2 SF?

Answer 82

SF don't matter in additon, remember

Answer 83

ugh i wont remember this lol

Answer 84

help me some more? lol

Answer 85

ok

Answer 86

thank you very much!

Answer 87

99.9/12.23

Answer 88

99.9 = 3
12.23= 4

Answer 89

yep

Answer 90

= 8.1684........

Answer 91

how do i do this one?

Answer 92

you want 3 SF, so you round to the nearest hundredth

Answer 93

how do i know what to round to? like if im suppose to round to the tens hund, thous?

Answer 94

for multiplication, you count, starting from the left,the digits, and stop and stop at the 3rd one in this case because you want 3 SF, you round that number

Answer 95

for multiplication, you count, starting from the left,the digits, and stop and stop at the 3rd one in this case because you want 3 SF, you round that number

Answer 96

hmm okay, so i round 8.168?

Answer 97

so it will be 8.17?

Answer 98

yes, you round the 6 up to 7 because the next digit is greater than 5