1. CONCISE Mathematics - Middle School - 7
2. Rational Numbers
3. Fractions (Including Problems)
4. Decimal Fractions (Decimals)
5. Exponents (including Laws of Exponents)
6. Ratio and Proportion (Including Sharing in a Ratio)
7. Unitary Method (including Time and Work)
8. Percent and Percentage
9. Profit, Loss and Discount
10. Simple Interest
11. Fundamental Concepts (Including Fundamental Operations)
12. Simple Linear Equations (Including Word Problems)
13. Set Concepts (Some Simple Divisions by Vedic Method)
14. Lines and Angles (Including Construction of angles)
16. Pythagoras Theorem
17. Symmetry (Including Reflection and Rotation)
18. Recognition of Solids (Representing 3-D in 2-D)
19. Congruency: Congruent Triangles
21. Data Handling
1. Exercise 8(A)
2. Exercise 8(B)
3. Exercise 8(C)
Q1) The salary of a man is increased from Rs. 600 per month to Rs. 850 per month. Express the increase in salary as a percent.
Q2) Increase :
(i) 60 by 5%
(ii) 20 by 15%
(iii) 48 by 121 %
(iv) 80 by 140%
(v) 1000 by 3.5%
Q3) Decrease :
(i) 80 by 20%
(ii) 300 by 10%
(iii) 50 by 12.5%
Q4) What number :
(i) When increased by 10% becomes 88?
(ii) When increased by 15% becomes 230?
(iii) When decreased by 15% becomes 170?
(iv) When decreased by 40% becomes 480?
(v) When increased by 100% becomes 100?
(vi) When decreased by 50% becomes 50?
Q5) The price of a car is lowered by 20% to Rs. 40,000. What was the original price? Also, find a reduction in price.
Q6) If the price of an article is increased by 25%, The increase is Rs. 10. Find the new price.
Q7) If the price of an article is reduced by 10%, the reduction is Rs. 40. What is the old price?
Q8) The price of a chair is reduced by 25%. What is the ratio of:
(i) Change in price to the old price.
(ii) Old price to the new price.
Q9) If x is 20% less than y, find :
Q10) If x is 30% more than y; find :
Q11) The weight of a machine is 40 kg. By mistake, it was weighed as 40.8 kg. Find the error percent.
Q12) From a cask, containing 450 litres of petrol, 8% of the petrol was lost by leakage and evaporation. How many litres of petrol was left in the cask?
Q13) An alloy consists of 13 parts of copper, 7 parts of zinc and 5 parts of nickel. What is the percentage of each metal in the alloy?
Q14) In an examination, first division marks are 60%. A student secures 538 marks and misses the first division by 2 marks. Find the total marks of the examination.
Q15) Out of 1200 pupils in a school, 900 are boys and the rest are girls. If 20% of the boys and 30% of the girls wear spectacles, find :
(i) how many pupils in all, wear spectacles?
(ii) what percent of the total number of pupils wear spectacles?
Q16) Out of 25 identical bulbs, 17 are red, 3 are black and the remaining are yellow. Find the difference between the numbers of red and yellow bulbs and express this difference as a percent.
Q17) A number first increases by 20% and then decreases by 20%. Find the percentage increase or decrease on the whole.
Q18) A number is first decreased by 40% and then again decreased by 60%. Find the percentage increase or decrease on the whole.
Q19) If 150% of a number is 750, find 60% of this number.
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CONCISE Mathematics - Middle School - 7
Fractions (Including Problems)
Decimal Fractions (Decimals)
Exponents (including Laws of Exponents)
Ratio and Proportion (Including Sharing in a Ratio)
Unitary Method (including Time and Work)
Percent and Percentage
Profit, Loss and Discount
Fundamental Concepts (Including Fundamental Operations)
Simple Linear Equations (Including Word Problems)
Set Concepts (Some Simple Divisions by Vedic Method)
Lines and Angles (Including Construction of angles)
Symmetry (Including Reflection and Rotation)
Recognition of Solids (Representing 3-D in 2-D)
Congruency: Congruent Triangles
Race To Space
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