**New Learning Composite Mathematics SK Gupta Anubhuti Gangal Class 7 Percentage and Its Applications Self Practice 8A Solution**

**(1) Express each of the following as a percentage.**

**(a) (i) 1/5 (ii) ¾ (iii) 17/50 (iv) 11/20 (v) 2-9/10 (vi) 2-8/25**

**(b) (i) 0.3 (ii) 0.47 (iii) 0.89 (iv) 1.05 (v) 0.09 (vi) 0.769 (vii) 3 (viii) 9.002 (ix) 2.25 (x) 0.75**

**(2) Express as a fraction in its simplest form.**

**(a) 80% (b) 36% (c) 60% (d) 19% (e) 62-1/2% (f) 133-1/3% (g) 120% (h) 65% (i) 270% (j) 350%**

**(3) Express as a decimal.**

**(a) 7% (b) 80% (c) 72% (d) 39% (e) 1-1/2% (f) 6-1/4% (g) 27-1/2% (h) 72-3/5% (i) 189% (j) 205-2/5%**

**(4) Compare and Write <,> or = in the box.**

**(a) 5/8 ___ 70%**

**(b) 64% ___ 3/5**

**(c) 92.7% ___ 0.927**

**(d) 0.99 ____ 100%**

**Solution:**

**(5) Arrange in ascending order.**

**(a) 38%, 0.4, 35-1/3%, 5/8**

**(b) 0.93, 19.20, 1-2/3, 67%**

**(6) Arrange in descending order.**

**(a) 4/5, 0.5, 500%, 66-2/3%**

**(b) 7/20, 0.038, 39%, 0.59**

**Solution:**

**(8) A molecular of water is made up of 2 atoms of hydrogen and 1 atom of oxugen. What percent of the atoms a water molecular is oxygen?**

**(9) Sterling silver is an alloy combining 925 parts of pure silver and 75 parts of another metal, such as copper. What percent of sterling silver is not pure silver?**

**(10) Prashant spends 4 hours a day on his self study, 1 hour playing video games and 1 hour in doing workouts at fitness centre. What per cent of the day does Prahant spend on these activities?**

**Solution:**