what are significant numbers?

Answer 1

Any NUMBER is significant if all of its DIGITs (FIGUREs) are significant.

Answer 2

Significant figures / digits:
- refers to the numbers that can be read easily from the scales of a measuring device plus a last uncertain number which is estimated between the smallest scales of a measuring device.

Rules:
1) All non-zero digits are always significant
9276 - 4 significant figures
92.76 - 4 significant figures
927.6 - 4 significant figures

2) A zero bet. a non-zero digit is always significant
101.5 - 4 SF
21.08 - 4 SF
3.09 - 3 SF

3) A zero to the right of a decimal point in a number equal to or greater than one (1) is significant.
1.0 - 2 SF
1.008 - 4 SF
7.803 - 4 SF

4) A zero to the right of a decimal point in a number less than one is significant.
.610 - 3 SF
.6500 - 4 SF
.7010 - 4 SF
.8900100 - 7 SF

5) A zero used to fix a decimal point in a number less than one is not significant.
0.001 - 1 SF
0.03501 - 4 SF
0.010030 - 5 SF

Answer 3

I think you mean significant digits....

Significant digits are those digits in numbers who has a meaning/importance to the value of the number.
e.g.
253
2,5 and 3 are all significant digits
3400
3,4 are the only significant digits.
0.0351
3,5 and 1 are all significant digits
205
All are significant digits
0.00300
The last 3 digits are all significant

RULES:
All non-zero digits are significant.
Zeroes between 2 significant digits are significant.
Zeroes both to the right of a decimal point AND to the right of at least 1 significant digit are significant.
Bars above zeroes indicate that they are significant.
All other zeroes not written in those ways are considered non-significant.

^_^

Answer 4

i believe you are talking about significant figures in a number

significant figures is a method of estimating a number.

you count the first significant figure as the first non-zero digit, and continue from then on.

for example, 5569 estimated to 3 significant figures is 5570
0.032512 estimated to 4 significant figures is 0.03251

Answer 5

5 Ft 7 in tall

26 years old.

37 23 34 (if you need these explained, you're too young to know).

IQ 133

All are significant.