Mental Maths Questions and Answers: Integers | Mental Math for Class 7 PDF Download

Q1: Find the sum of -52 and -87.
Ans: -139

Q2: Find the sum of -2035 and 285.
Ans: -1750

Q3: Subtract -46 from 144.
Ans: 190

Q4: What is the additive inverse of 285-(135 + 150).
Ans: 0

Q5: Subtract the sum of -1878 and 878 from 3000.
Ans: 4000

Q6: Simplify {-13 - (-27)} + {-25 - (-40)}.
Ans: 29

Q7:  Find the value of 1487 x 325 + (-487) x 325.
Ans: 325000

Q8: Find the value of 2895 x 99 - (-2895).
Ans: 289500

Q9: Find the value of 1200 ÷ 20 - 14.
Ans: 46

Q10: Evaluate 32 - (2 x 5) + 4.
Ans: 26

Q11: Find the two integers which have difference 6 and sum -18.
Ans: -6,-12

Q12: What is the sum of first seven negative integers?
Ans: -28

Q13: What is the product of first 3 multiples of 5?
Ans: 750

Q14: Find the product of (-125) x (-537) x (-8).
Ans: -537000

Q15: How many odd integers less than 100 are a multiple of both 3 and 5?
Ans: 3

Q16: Subtract the sum of (-1032) and 878 from -34.
Ans: 120

Q17: Find the product of 225 x (-15).
Ans: -3,375

Q18: Simplify: (-3) + (-12) ÷ (-4) - 3 x (-3).
Ans: 9

Q19: Simplify:
Ans: 0

Q20: Find the number which is obtained when three is multiplied by one less than the difference of nineteen and five.
Ans: 39

Q21: Some number added to -11 is 37. Divide this number by -12. Then, multiply by -8 . What is the final number?
Ans: 32

Q22: Find the number obtained when ninety is divided by three more than the sum of 8 and 7.
Ans: 5

Q23: Find: 6 x 9 x 0 - 8÷4
Ans: -2

Q24: Find: 90 - (-3) x (-3) x (-3)
Ans: 117

Q25: (-1)²⁷ x (-1)³⁵ =?
Ans: 1

Q26: Evaluate: 795 x (-25) + (-795) x 75
Ans: -79500

Q27: What is the sum of first ten positive and first ten negative integers?
Ans: 0

Q28: Divide 324 by (-27).
Ans: -12

Q29: Evaluate: {(-30) ÷ 5} ÷ 2
Ans: -3

Q30: The product of two integers is 729. If one of the integer is (-27), find the other integer.
Ans: -27

Q31: What will be the quotient if (-15625) is divided by (-125)?
Ans: 125

Q32: A group of hikers is descending the mountain at a rate of 600 feet per hour. What is the change in elevation of the hikers after 6 hours?
Ans: 3600 feet

Q33: Arrange the following in increasing order: -2,-9,7,-6, 5, 0,-3
Ans: -9,-6,-3,-2, 0, 5, 7

Q34: Simplify: 
Ans: 180

Q35: Determine the integer whose product with -3 becomes zero.
Ans: 0

Q36: A man drives his car at a speed of 40 km/hr. How long will it take to cover 160 km?
Ans: 4 hours

Q37: In a test (+6) marks are given for every correct answer and (-3) marks are given for every incorrect answer and 0 for answer not attempted. Ramesh gets 5 correct and 8 incorrect out of 15 questions. What is his total score?
Ans: 6

Q38: Determine the integer whose product with -13 is -351.
Ans: 27

Q39: Sara monitors a snail in her aquarium. She notes that this morning it crawled 1 inch up the glass. A few hours later it crawled another 2 inch up the glass. Later, it crawled 4 inch down the glass. How far is the snail from where it started?
Ans: 1 inch down

Q40: Find the product of first four odd negative integers?
Ans: 105

Q41: What is the multiplicative inverse of (-150 + 85)?
Ans: -1/65

Q42: Simplify: -(20) + (-8) ÷ (-2) x 3.
Ans: -8

Q43: An elevator descends into a mine shaft at the rate of 7 m/min. If the descend starts from 5m above the ground level, how long will it take to reach -205m?
Ans: 30 minutes

Q44: The sum of two integers is -1500. If one of them is 599, then find the other integer.
Ans: -2099

Q45: Evaluate: 24 + 12 ÷ 4 - 5 x  3.
Ans: 12

Q46: Garvit earns a profit of ₹2 by selling one pen and suffers  a loss of 50 paisa by selling one pencil. One day, Garvit earns a profit of ₹10 if he sold 15 pens, then how many pencils did he sell?
Ans: 40 pencils

Q47: Add the additive inverse of  to the product of -2, -3 and -4.
Ans: -26

Q48: From the given number line, find the additive inverse of (A - B - C)

Ans: 7

Q49: From the given number line, find the multiplicative inverse of [(A - B)C].

Ans: 1/400

Q50: The product of three integers is -900. It two of them are +25 and -6, find the third integer.
Ans: 6

For detail explanation of solutions refer to the videos provided