Please solve-
1. Estimate each of the following using general rule of addition & subtraction:
(a) 730 + 998 (b) 796 – 314 (c) 12,904 +2,888 (d) 28,292 – 21,496
2. Give a rough estimate by rounding off to nearest hundreds and solve.
(a) 439 + 334 + 4,317 (b) 1,08,734 – 47,599 (c) 8325 – 491
(d) 4,89,348 – 48,365
3. Give a closer estimate by rounding off to nearest tens and solve.
(a) 439 + 334 + 4,317 (b) 1,08,734 – 47,599 (c) 8325 – 491
(d) 4,89,348 – 48,365
4. Estimate the following products using general rule of product:
(a) 578 × 161 (b) 5281 × 3491 (c) 1291 × 592 (d) 9250 × 29
Answers
Answer
1. Estimate each of the following using general rule of addition & subtraction:
(a) 730 + 998
sol:
=700+1000
=1700.
(b) 796 – 314
= 800- 300
= 500.
(c) 12,904+2,888
sol:
= 13,000+3000
= 16000
(d) 28,292 – 21,496
sol:
= 28,000-21,000
= 7000.
2. Give a rough estimate by rounding off to nearest hundreds and solve.
(a) 439 + 334 + 4,317
sol:
= 400+300+4,300
=5,000
(b) 1,08,734 – 47,599
sol:
= 1,08,700-47,600
= 61,100
(c) 8325 – 491
sol:
= 8300-500
= 7800
(d) 4,89,348 – 48,365
sol:
= 4,89,300,-48,400
= 4,40,900
3. Give a closer estimate by rounding off to nearest tens and solve.
a) 439 + 334 + 4,317
sol:
= 440+330+4,320
= 5,090
(b) 1,08,734 – 47,599
sol:
= 1,08,730-47,600
= 61,130
(c) 8,325 – 491
sol:
= 8,330-490
= 7,840
(d) 4,89,348 – 48,365
sol:
= 4,89,350-48,370
= 44,0 980
4. Estimate the following products using general rule of product:
(a) 578 × 161
sol:
= 600×200
= 1,20,000
(b) 5,281 × 3,491
sol:
= 5,000×3,000
= 1,50,00,000
(c) 1291 × 592
sol:
= 1,000×600
= 60,00,000
(d) 9,250 × 29
sol:
= 9,000×30
= 2,70,000.