Question

Estimate the following products using general rule:(a)   578 × 161   (b)    5281 × 3491      (c) 1291 × 592   (d) 9250 × 29Make four more such examples

Answer 1

(a) `578*161`
`578-> 600 , 161= 200`
`600*200 = 120000`
(b) `5281*3491`
`5281-> 5000, 3491-> 3000`
`5000*3000= 15000000`
(c) `1291*592`
`1291-> 1000`
`592-> 600`
`1000*600 = 600000`
(d) `9250*29`
`9250 -> 9000, 29->30`
`9000*30 = 270000`
examples are
1) `341*128`
`341-> 300, 128->100`
`300*100=30000`
2) `568*831`
`568-> 600, 831-> 800`
`600*800 = 480000`
3) `1782*332`
`1782-> 2000, 332-> 300`
`2000*300 = 600000`
4) `8792*3777`
`8792-> 9000, 3777-> 4000`
`9000*4000= 36000000`
answer