TN 7th Maths | Exercise 1.3 Full | Term 1 | Number System | AlexMaths | TamilNadu

#tnnewsyllabus Join this channel to get access to perks:    / @alexmaths   #7thmathsterm1 #7thmaths 1. Fill in the blanks (i) −80 × ____ = −80 (ii) (−10)× ____ = 20 (iii) (100)× ____ = −500 (iv) ____×(−9) = −45 (v) ____× 75 = 0 2. Say true or false (i) (−15)× 5 = 75 (ii) (−100)× 0 × 20 = 0 (iii) 8 × (−4) = 32 3. What will be the sign of the product of the following. (i) 16 times of negative integer. (ii) 29 times of negative integer 4. Find the product of (i) (−35)× 22 (ii) (−10)×12 ×(−9) (iii) (−9)×(−8)×(−7)×(−6) (iv) (−25)× 0 × 45 × 90 (v) (−2)×(+50)×(−25)× 4 5. Check the following for equality and if they are equal, mention the property. (i) (8 −13)× 7 and 8 −(13 × 7) (ii) [(−6)−(+8)]×(−4) and (−6)−[8 ×(−4)] (iii) 3 ×[(−4)+(−10)]and [3 ×(−4)+ 3 ×(−10)] 6. During summer, the level of the water in a pond decreases by 2 inches every week due to evaporation. What is the change in the level of the water over a period of 6 weeks? 7. Find all possible pairs of integers that give a product of −50 . 8. Which of the following expressions is equal to –30. (i) –20 – (–5 x 2) (ii) (6 x 10) – (6 x 5) (iii) (2 x 5) + (4 x 5) (iv) (–6) x (+5) 9. Which property is illustrated by the equation: (5 × 2)+(5 × 5) = 5 × (2 + 5) (i) commutative (ii) closure (iii) distributive (iv) associative 10. 11×(–1)=_____ (i) –1 (ii) 0 (iii) +1 (iv) –11 11. (−12)× (−9) = _____ (i) 108 (ii) –108 (iii) +1 (iv) –1