Question

Estimate each of the following using general rule :Make ten more such examples of addition, subtraction and estimation of their outcome.
$28,292-21,496$

Answer 1

Step 1 : Evaluate subtraction by rounding off to nearest thousands

Given, $28,292-21,496$

Round off to thousands

$28292$ round off to $28000$

$21496$ round off to $21000$

Hence,

$28292–21496=28000–21000=7000$

Step 2 : Make ten more such examples

Ten more such examples are

$i.330+280=300+300=600$
$ii.3937+5990=4000+6000=10000$
$iii.6392–3772=6000–4000=2000$
$iv.5440–2972=5000–3000=2000$
$v.2175+1206=2000+1000=3000$
$vi.1110–1292=1000–1000=0$
$vii.910+575=900+600=1500$
$viii.6400–4900=6000–5000=1000$
$ix.3731+1300=4000+1000=5000$
$x.6485–4319=6000–4000=2000$