Exercise No. 2E

NOTE: Answers to all questions are given at the end of this exercise.

Question No. 1:

Copy and complete the following by filling in an appropriate operation symbol in each box:

(a) (-5)□3=3□(-5)=-15

(b) 23□(-11)=-11□23=12

(c) -64□(-36)=-36□(-64)=100

(d) -6□(-15)=-15□(-6)=90

 

Question No. 2:

Replace each □ with an integer.

(a) (-3)×(□+8)=(-3)×(-28)+(-3)×8=□

(b) (-16)×(12+6×12)=(16×16)×□=□

(c) (-5)×(4-□)=[(-5)×(-4)]-[(-5)×(-14)]=□

(d) (-11)×(8-9)=[(-11)×□]-[(-11)×□]=□

(e) (-11×10)-(9×1)=[-11×(-9)]×□=□

(f) [-15-(-5)]×(-9)=[□×(-9)]-[(-5)×□]=□

 

Question No. 3:

Evaluate the following:

(a) 5×2-(-3)

(b) 5×2[3×(-2)-10]

(c) √10-3×(-2)

(d) [3-(-2)]³

(e) 24×(-2)×5÷(-6)

(f) (16-24)-(57-77)÷(-2)

(g) [(+12-18)÷3-5]×(-4)

(h) 160÷(-40)-20÷(-5)

(i) 2×(-2)+(-2)×(-3)+2×(-3)

(j) {[(-15+5)×2+8]-32÷8}-(-7)

(k) [3×(-3)-4×(-2)+5×2]+[-2×(-3)+8×(-2)-8×2]

 

Answers

(from left to right)

2e-i 2e-ii 2e-iii


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