S Chand ICSE Mathematics Class 6 Solution Second Chapter Natural Numbers and Whole Numbers Exercise 2D (O.P. Malhotra, S.K. Gupta, Anubhuti Gangal)
Exercise 2D
(1) FILL IN THE BLANKS WITH A WHOLE NUMBER TO MAKE EACH OF THE FOLLOWING A TRUE STATEMENT:
(a)23987 x 0 = 0
(b) 59083 x 1 = 59083
(c) 879 x 56 = 56 x 879
(d) 100x100x10=100000
(e) 27x98x35=35x98x27
(f)87×19=19x(80+7)
(g) 205×69=69×200+5
(2) FILL IN THE BLANKS :
(a) 56×39=56x(30+9)+56×9
(b) 37×19=37x(10+9)+37×5+37×9
(c) 18 x 47=18 x (50-3)-18×3
(d) 76×88=76x(90-2)-76×2
(3) WHAT NUMBER SHOULD REPLACE EACH n ?
(1) (a) 3 (n+6)=(3×5)+(3×6)
Sol) 3n+18=15+18
Or,3n+18=33-18
Or,3n= 15
Or, n=15/3 =5
(b) (7×4)+(nx3)=7(4+3)
Sol) 28+3n=28+21
Or, 3n= 49-28
Or, n=21/3 =7
(4) MULTIPLY BY SUITABLE ARRANGEMENT:
(a) (5×8)x7x25=56x7x25= 392×25=9800
(b) (25×4)x598= 100×598=59800
(c)(250×4)x2893=1000×2893=2893000
(d)(2867×2)x50= 5734×50=286700
(e)(125×8)x786= 1000×786=786000
(f)(625×16)x3982 =10000×3982=39820000
(g) (80×5)x394=400×394=157600
(h) (15×8)x40x225=120x40x225=1080000
(i) (16×80)x25x15237=1280x24x15237=468080640
(5) FIND EACH OF THE FOLLOWING PRODUCTS BY USING PROPERTIES OF MULTIPLICATION :
(a) 972×8+972×2= 7776+1944=9720
(b) 982×46+27×982-58×982-15×982=45172+26514-56956-14730=45172+26514+71686=143372
(c)957x10x583-483×9570= 957x10x100x9570=9158490000
(6) USING PROPERTIES OF ADDITION AND MULTIPLICATION, FIND EACH OF THE FOLLOWING PRODUCTS.
(a) 928×857 = (900+20+8)x857) = 795296
(b)3046×729 = (3000+40+6)x729 = 2220534
(c) 849×205 = (800+40+9)x205 = 174045
(d)367×10004 = (300+60+7)x10004= 3671468