Selina Concise Class 6 Math Chapter 17 Fundamental Operations Exercise 17D Solution
EXERCISE 17D
(1) Multiply:
Contents
(2) Multiply:
(i) 5x × 3x2 × x3
= (5 × 3) x1+2+3
= 15x6
(ii) 2 × 8m2 × 4m5
= (2 × 8 × 4) m2+5
= 64m7
(iii) 0 × 8ax × (7/8) bx
= 0
(iv) – (4/5) y3 × 0 × (5/8) y4
= 0
(v) 2mn × (- 3mn) × 5mn
= – (2 × 3 × 5) m1+1+1n1+1+1
= – 30m3n3
(vi) 7ab × (- 2ab) × (- ab)
= (7 × 2)a1+1+1b1+1+1
= 14a3b3
(3) Multiply:
(4) Evaluate:
(v) (- 3ab) × (- 2a2b) × (- 5ab3)
= – (3 × 2 × 5) a1+2+1b1+1+3
= – 30a4b5
(vi) (- 2x) × (- 4x2) × (- 5x3) × (- x4)
= (2 × 4 × 5) x1+2+3+4
= 40x10
(vii) (- x2y) × (xy3) × (- x5y2)
= x2+1+5y1+3+2
= x3y6