Question

Estimate each of the following products by rounding off each number to nearest tens:
(a) 87 × 32
(b) 311×113
(c) 3239 × 28
(d) 1385 × 789

Answer 1

i)87*32 
by rounding off each number to nearest tens
90*30 =2700
ii)311*113
by rounding off each number to nearest tens
310*110=34100
iii)3239*28
by rounding off each number to nearest tens
3240*30=97200
iv)1385*789
by rounding off each number to nearest tens
1390*790 =1098100

Answer 2

(a)2700 
(B)34100
(C)97200
(D)1098100.