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

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:


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