Answer:
The answer is below
Explanation:
When estimating significant numbers, the following applies:
i) All non zero digits are significant
ii) Zeros before non zero digits are not significant
iii) Zeros placed between non zero digits are significant
iv) Trailing zeros to the right of decimals or trailing zeros in whole number are significant.
When estimating, we use the number with the highest number of significant figure.
a) 97.381 ÷ 4.2502 + 0.99195
=22.912098 + 0.99195 = 23.90405 to 5 s.f
b) 171.5 + 72.915 – 8.23 (72.915 has 5 s.f)
= 236.185 to 3 s.f
c) 1.00914 ÷ 0.87104 + 1.2012 (1.00914 has 6 s.f)
= 2.35975 to 6 s.f
d) 21.901 – 13.21 – 4.0215 (21.901 has 5 s.f)
= 4.4895 to 5 s.f
