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Page 1 Chapter 10: Equations PRACTICE SET 26 [PAGE 51] Practice Set 26 | Q 1 | Page 51 Different mathematical operations are given in the two rows below. Find out the number you get in each operation and make equations. 16 ÷ 2; 5 × 2; 9 + 4; 72 ÷ 3; 4 + 5; 8 × 3; 19 - 10; 10 - 2; 37 - 27; 6 + 7 SOLUTION 16 ÷ 2 = 8 5 × 2 = 10 9 + 4 = 13 72 ÷ 3 = 24 4 + 5 = 9 8 × 3 = 24 19 - 10 = 9 10 - 2 = 8 37 - 27 = 10 6 + 7 = 13 So, 16 ÷ 2 = 10 - 2 5 × 2 = 37 - 27 9 + 4 = 6 + 7 72 ÷ 3 = 8 × 3 4 + 5 = 19 - 10 PRACTICE SET 27 [PAGE 55] Practice Set 27 | Q 1.1 | Page 55 Rewrite the following using a letter. Page 2 Chapter 10: Equations PRACTICE SET 26 [PAGE 51] Practice Set 26 | Q 1 | Page 51 Different mathematical operations are given in the two rows below. Find out the number you get in each operation and make equations. 16 ÷ 2; 5 × 2; 9 + 4; 72 ÷ 3; 4 + 5; 8 × 3; 19 - 10; 10 - 2; 37 - 27; 6 + 7 SOLUTION 16 ÷ 2 = 8 5 × 2 = 10 9 + 4 = 13 72 ÷ 3 = 24 4 + 5 = 9 8 × 3 = 24 19 - 10 = 9 10 - 2 = 8 37 - 27 = 10 6 + 7 = 13 So, 16 ÷ 2 = 10 - 2 5 × 2 = 37 - 27 9 + 4 = 6 + 7 72 ÷ 3 = 8 × 3 4 + 5 = 19 - 10 PRACTICE SET 27 [PAGE 55] Practice Set 27 | Q 1.1 | Page 55 Rewrite the following using a letter. The sum of a certain number and 3. SOLUTION Let a certain number be x. ? Sum of a certain number and 3 = x + 3 Practice Set 27 | Q 1.2 | Page 55 Rewrite the following using a letter. The difference obtained by subtracting 11 from another number. SOLUTION Let another number be x. ? Difference obtained by subtracting 11 from another number = x – 11 Practice Set 27 | Q 1.3 | Page 55 Rewrite the following using a letter. The product of 15 and another number. SOLUTION Let another number be x. ? Product of 15 and another number = 15 × x = 15x Practice Set 27 | Q 1.4 | Page 55 Rewrite the following using a letter. Four times a number is 24. SOLUTION Let the number be x. Four time a number = 24 ? 4 × x = 24 ? 4x = 24 Practice Set 27 | Q 2.1 | Page 55 Find out which operation must be done on both sides of these equation in order to solve them. x + 9 = 11 SOLUTION Subtract 9 from both sides Page 3 Chapter 10: Equations PRACTICE SET 26 [PAGE 51] Practice Set 26 | Q 1 | Page 51 Different mathematical operations are given in the two rows below. Find out the number you get in each operation and make equations. 16 ÷ 2; 5 × 2; 9 + 4; 72 ÷ 3; 4 + 5; 8 × 3; 19 - 10; 10 - 2; 37 - 27; 6 + 7 SOLUTION 16 ÷ 2 = 8 5 × 2 = 10 9 + 4 = 13 72 ÷ 3 = 24 4 + 5 = 9 8 × 3 = 24 19 - 10 = 9 10 - 2 = 8 37 - 27 = 10 6 + 7 = 13 So, 16 ÷ 2 = 10 - 2 5 × 2 = 37 - 27 9 + 4 = 6 + 7 72 ÷ 3 = 8 × 3 4 + 5 = 19 - 10 PRACTICE SET 27 [PAGE 55] Practice Set 27 | Q 1.1 | Page 55 Rewrite the following using a letter. The sum of a certain number and 3. SOLUTION Let a certain number be x. ? Sum of a certain number and 3 = x + 3 Practice Set 27 | Q 1.2 | Page 55 Rewrite the following using a letter. The difference obtained by subtracting 11 from another number. SOLUTION Let another number be x. ? Difference obtained by subtracting 11 from another number = x – 11 Practice Set 27 | Q 1.3 | Page 55 Rewrite the following using a letter. The product of 15 and another number. SOLUTION Let another number be x. ? Product of 15 and another number = 15 × x = 15x Practice Set 27 | Q 1.4 | Page 55 Rewrite the following using a letter. Four times a number is 24. SOLUTION Let the number be x. Four time a number = 24 ? 4 × x = 24 ? 4x = 24 Practice Set 27 | Q 2.1 | Page 55 Find out which operation must be done on both sides of these equation in order to solve them. x + 9 = 11 SOLUTION Subtract 9 from both sides x + 9 = 11 ? x + 9 - 9 = 11 - 9 (Subtract 9 from both sides) ? x + 0 = 2 ? x = 2 Practice Set 27 | Q 2.2 | Page 55 Find out which operation must be done on both sides of these equation in order to solve them. x - 4 = 9 SOLUTION Add 4 to both sides x - 4 = 9 ? x - 4 + 4 = 9 + 4 (Add 4 to both sides) ? x + 0 = 13 ? x = 13 Practice Set 27 | Q 2.3 | Page 55 Find out which operation must be done on both sides of these equation in order to solve them. 8x = 24 SOLUTION Practice Set 27 | Q 2.4 | Page 55 Find out which operation must be done on both sides of these equation in order to solve them. Page 4 Chapter 10: Equations PRACTICE SET 26 [PAGE 51] Practice Set 26 | Q 1 | Page 51 Different mathematical operations are given in the two rows below. Find out the number you get in each operation and make equations. 16 ÷ 2; 5 × 2; 9 + 4; 72 ÷ 3; 4 + 5; 8 × 3; 19 - 10; 10 - 2; 37 - 27; 6 + 7 SOLUTION 16 ÷ 2 = 8 5 × 2 = 10 9 + 4 = 13 72 ÷ 3 = 24 4 + 5 = 9 8 × 3 = 24 19 - 10 = 9 10 - 2 = 8 37 - 27 = 10 6 + 7 = 13 So, 16 ÷ 2 = 10 - 2 5 × 2 = 37 - 27 9 + 4 = 6 + 7 72 ÷ 3 = 8 × 3 4 + 5 = 19 - 10 PRACTICE SET 27 [PAGE 55] Practice Set 27 | Q 1.1 | Page 55 Rewrite the following using a letter. The sum of a certain number and 3. SOLUTION Let a certain number be x. ? Sum of a certain number and 3 = x + 3 Practice Set 27 | Q 1.2 | Page 55 Rewrite the following using a letter. The difference obtained by subtracting 11 from another number. SOLUTION Let another number be x. ? Difference obtained by subtracting 11 from another number = x – 11 Practice Set 27 | Q 1.3 | Page 55 Rewrite the following using a letter. The product of 15 and another number. SOLUTION Let another number be x. ? Product of 15 and another number = 15 × x = 15x Practice Set 27 | Q 1.4 | Page 55 Rewrite the following using a letter. Four times a number is 24. SOLUTION Let the number be x. Four time a number = 24 ? 4 × x = 24 ? 4x = 24 Practice Set 27 | Q 2.1 | Page 55 Find out which operation must be done on both sides of these equation in order to solve them. x + 9 = 11 SOLUTION Subtract 9 from both sides x + 9 = 11 ? x + 9 - 9 = 11 - 9 (Subtract 9 from both sides) ? x + 0 = 2 ? x = 2 Practice Set 27 | Q 2.2 | Page 55 Find out which operation must be done on both sides of these equation in order to solve them. x - 4 = 9 SOLUTION Add 4 to both sides x - 4 = 9 ? x - 4 + 4 = 9 + 4 (Add 4 to both sides) ? x + 0 = 13 ? x = 13 Practice Set 27 | Q 2.3 | Page 55 Find out which operation must be done on both sides of these equation in order to solve them. 8x = 24 SOLUTION Practice Set 27 | Q 2.4 | Page 55 Find out which operation must be done on both sides of these equation in order to solve them. SOLUTION Practice Set 27 | Q 3 | Page 55 Given below are some equations and the values of the variables. Are these values the solutions to those equations? No Equation Value of the variable Solution (Yes/No) 1 y - 3 = 11 y = 3 No 2 17 = n + 7 n = 10 3 30 = 5x x = 6 4 m/2 = 14 m = 7 SOLUTION No Equation Value of the variable Solution(Yes / No) 1 y - 3 = 11 y = 3 No 2 17 = n + 7 n = 10 Yes 3 30 = 5x x = 6 Yes 4 m 2 =14m 2 = 14 m = 7 No Explanation: (1) When y = 3, LHS = y - 3 = 3 - 3 = 0 RHS = 11 Since LHS ? RHS, so y = 3 is not a solution of equation y - 3 = 11. (2) When n = 10, Page 5 Chapter 10: Equations PRACTICE SET 26 [PAGE 51] Practice Set 26 | Q 1 | Page 51 Different mathematical operations are given in the two rows below. Find out the number you get in each operation and make equations. 16 ÷ 2; 5 × 2; 9 + 4; 72 ÷ 3; 4 + 5; 8 × 3; 19 - 10; 10 - 2; 37 - 27; 6 + 7 SOLUTION 16 ÷ 2 = 8 5 × 2 = 10 9 + 4 = 13 72 ÷ 3 = 24 4 + 5 = 9 8 × 3 = 24 19 - 10 = 9 10 - 2 = 8 37 - 27 = 10 6 + 7 = 13 So, 16 ÷ 2 = 10 - 2 5 × 2 = 37 - 27 9 + 4 = 6 + 7 72 ÷ 3 = 8 × 3 4 + 5 = 19 - 10 PRACTICE SET 27 [PAGE 55] Practice Set 27 | Q 1.1 | Page 55 Rewrite the following using a letter. The sum of a certain number and 3. SOLUTION Let a certain number be x. ? Sum of a certain number and 3 = x + 3 Practice Set 27 | Q 1.2 | Page 55 Rewrite the following using a letter. The difference obtained by subtracting 11 from another number. SOLUTION Let another number be x. ? Difference obtained by subtracting 11 from another number = x – 11 Practice Set 27 | Q 1.3 | Page 55 Rewrite the following using a letter. The product of 15 and another number. SOLUTION Let another number be x. ? Product of 15 and another number = 15 × x = 15x Practice Set 27 | Q 1.4 | Page 55 Rewrite the following using a letter. Four times a number is 24. SOLUTION Let the number be x. Four time a number = 24 ? 4 × x = 24 ? 4x = 24 Practice Set 27 | Q 2.1 | Page 55 Find out which operation must be done on both sides of these equation in order to solve them. x + 9 = 11 SOLUTION Subtract 9 from both sides x + 9 = 11 ? x + 9 - 9 = 11 - 9 (Subtract 9 from both sides) ? x + 0 = 2 ? x = 2 Practice Set 27 | Q 2.2 | Page 55 Find out which operation must be done on both sides of these equation in order to solve them. x - 4 = 9 SOLUTION Add 4 to both sides x - 4 = 9 ? x - 4 + 4 = 9 + 4 (Add 4 to both sides) ? x + 0 = 13 ? x = 13 Practice Set 27 | Q 2.3 | Page 55 Find out which operation must be done on both sides of these equation in order to solve them. 8x = 24 SOLUTION Practice Set 27 | Q 2.4 | Page 55 Find out which operation must be done on both sides of these equation in order to solve them. SOLUTION Practice Set 27 | Q 3 | Page 55 Given below are some equations and the values of the variables. Are these values the solutions to those equations? No Equation Value of the variable Solution (Yes/No) 1 y - 3 = 11 y = 3 No 2 17 = n + 7 n = 10 3 30 = 5x x = 6 4 m/2 = 14 m = 7 SOLUTION No Equation Value of the variable Solution(Yes / No) 1 y - 3 = 11 y = 3 No 2 17 = n + 7 n = 10 Yes 3 30 = 5x x = 6 Yes 4 m 2 =14m 2 = 14 m = 7 No Explanation: (1) When y = 3, LHS = y - 3 = 3 - 3 = 0 RHS = 11 Since LHS ? RHS, so y = 3 is not a solution of equation y - 3 = 11. (2) When n = 10, RHS = n + 7 = 10 + 7 = 17 LHS = 17 Since LHS = RHS, so n = 10 is a solution of equation 17 = n + 7. (3) When x = 6, RHS = 5x = 5 × 6 = 30 LHS = 30 Since LHS = RHS, so x = 6 is a solution of equation 30 = 5x. (4) When m = 7, Since LHS ? RHS, so m = 7 is not a solution of equation m/2 = 14 Practice Set 27 | Q 4.1 | Page 55 Solve the following equation: y - 5 = 1 SOLUTION y - 5 = 1 ? y - 5 + 5 = 1 + 5 (Add 5 to both sides) ? y + 0 = 6 ? y = 6 Thus, the solution of the given equation is y = 6. Practice Set 27 | Q 4.2 | Page 55 Solve the following equation: 8 = t + 5 SOLUTION 8 = t + 5 ? 8 - 5 = t + 5 - 5 (Subtract 5 from both sides) ? 3 = t + 0Read More
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