Express the following upto four significant figures :
(i) 6.45372
(ii) 32.3928

Express the following to four significant figures: (i) 6.45372, (ii) 48.38250, (iii) 70000, (iv) 2.65986 xx 10^(3) , (v) 0.004687

Express the following to four significant figures : 6.608792

Express the following to four significant figures 12.6552

Express the following to four significant figures 45.3712

Express the following to four significant figures 23.4551

Express the following to four significant figures : 42.392800

Express the following to four significant figures 1.236981

Express the following numbers to four significant figures : (i) 5.607892 (ii) 32.392800 (iii) 1.78986 xx 10^3 (iv) 0.007837.