3. Estimate the product and verify by actual calculation.
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3. 1. 48 × 7
48 =50
7=10
50×10=500
ii)65×57
65=70
57=60
70×60=4200
iii)325×6
325=330
6=10
330×10=3300
iv)65×21
65=70
21=20
70×20=1400
v)58×83
58=60
83=80
60×80= 4800
vi)434×87
434=430
87=90
430×90=38700
vii)702×65
702=700
65=70
700×70=49000
viii)815×477
815=820
477=480
820×480= 393600
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