Calculate the answer up to appropriate numbers of significant digits
(a) 246.24 + 238.278 + 98.3
(b) 1.4 x 2.639 + 117.25
(c) (2.66 x 10⁴) - (1.03 x10³)
(d) (112 x 0.456) / (3.2 x 120)
(e) 168.99 x 9
(f) 1023 + 8.5489
Ans [(a) 582.8 , (b) 120.9, (c) 2.56 x 10⁴, (d) 0.13 , (e) 2000 & (f) 1032 ]
Solution:
(b) 1.4 x 2.639 + 117.25
Calculation:
(c) (2.66 x 10⁴) - (1.03 x10³)
Calculation:
these can be subtracted only when the term has the same power as the base 10. So,
1.03 x10³ = 0.103 x10⁴
(2.66 x 10⁴) - (1.03 x10³) = (2.66 x 10⁴) - (0.103 x10⁴)
= 2.557 x 10⁴
Here the rules of significant figures for subtraction should be applied, which is the same as addition. So.
the result should be round to the 2 d.p. therefore
(2.66 x 10⁴) - (1.03 x10³) = 2.56 x 10⁴ -------Ans
(d) (112 x 0.456) / (3.2 x 120)
Calculation:
Calculation:
168.99 x 9 = 1520.9 = 2000 = 2 x 10³ -----Ans
(f) 1023 + 8.5489
Calculation:
0 Comments
If you have any QUESTIONs or DOUBTS, Please! let me know in the comments box or by WhatsApp 03339719149