Question

Q22. Estimate the following:
a) 3333 + 5298
f) 45867 - 376
b) 21397 + 824
g) 8 x 795
c) 7349 + 85893 h) 3569 x 277
d) 7286 - 3985
i) 794 - 168
e) 8074 - 808
k) 879 - 29​

Answer 1

$a) \red{ 3333 + 5298 }$

$We \: shall \: round \: off \: these \: numbers \\to \: the \: nearest \: thousands .$

$3333 \: is \: rounded \: off \: to \: 3000$

$5298 \: is \: rounded \: off \: to \: 5000$

$\red{ Estimated \: sum \: of \: 3333+5298} \\= 3000 + 5000 \\\green {= 8000 }$

$f) \red{ 45867 - 376 }$

$45867 \: is \: rounded \: off \: to \: 46000$

$376 \: is \: rounded \: off \: to \: 400$

$\red{ Estimated \: difference \: of \: 45867 -:376} \\= 46000 - 400 \\\green {= 45600 }$

$b) \red{21397 + 824 }$

$21397 \: is \: rounded \: off \: to \: 21000$

$824 \: is \: rounded \: off \: to \: 800$

$\red{ Estimated \: sum \: of \: 21397 + 824} \\= 21000 + 800 \\\green {= 21800 }$

$g) \red{8 \times 795}$

$8 \: is \: rounded \: off \: to \: 10$

$795 \: is \: rounded \: off \: to \: 800$

$\red{ Estimated \: product \: of \: 8 \times 795} \\= 10 \times 800 \\\green {= 8000 }$

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