EXERCISE-1D
Question 1
Q.1. Round each of the following numbers to the nearest ten :
(a) 36
(b) 173
(c) 3869
(d) 16378
Ans.
(a) 40
(b) 170
(c) 3870
(d) 16380
Question 2
Q.2. Round each of the following numbers to the nearest hundred :
(a) 814
(b) 1254
(c) 43126
(d) 98165
Ans.
(a) 800
(b) 1300
(c) 43100
(d) 98200
Question 3
(a) 793
(b) 4826
(c) 16719
(d) 28394
Ans.
(a) 1000
(b) 5000
(c) 17000
(d) 28000
Question 4
(a) 17514
(b) 26340
(c) 34890
(d) 272685
Ans.
(a) 20000
(b) 30000
(c) 30000
(d) 270000
Question 5
Estimate each sum to the nearest ten:
Q.5. $(57+34)$
Ans.
$(57+34)$
57 estimated to the nearest ten $=60$
34 estimated to the nearest ten $=30$
Required sum $=60+30=90$
Ans.
$(57+34)$
57 estimated to the nearest ten $=60$
34 estimated to the nearest ten $=30$
Required sum $=60+30=90$
Question 6
Ans.
$(43+78)$
43 estimated to the nearest ten $=40$
78 estimated to the narest ten $=80$
Required sum $=40+80=120$ Ans.
Question 7
Ans.
$(14+69)$
14 estimated to the nearest ten $=10$
69 estimated to the nearest ten $=70$
Required sum $=10+70=80$ Ans.
Question 8
Ans.
$(86+19)$
86 estimated to the nearest ten $=90$
19 estimated to the nearest ten $=20$
Required sum $=90+20=110$ Ans.
Question 9
Ans.
$(95+58)$
95 estimated to the nearest ten $=100$
58 estimated to the nearest ten $=60$
$\therefore$ Required sum $=100+60=160$
Question 10
Ans.
77 estimated to the nearest ten $=80$
63 estimated to the nearest ten $=60$
$\therefore$ Required sum $=80+60=140$
Question 11
Q.11. (356 + 275).
Ans.
$(356+275)$
356 estimated to the nearest ten $=360$
275 estimated to the nearest ten $=280$
$\therefore$ Required sum $=360+280=640$
Question 12
Ans. $463+182$
463 estimated to the nearest ten $=460$
182 estimated to the nearest ten $=180$
$\therefore$ Required sum $=460+180=640$
Question 13
Ans. $(538+276)$
538 estimated to the nearest ten $=540$
276 estimated to the nearest ten $=280$
Required sum $=540+280=820$
Question 14
Q.14. $(236+689)$.
Ans.
$(236+689)$
236 estimated to the nearest hundred $=200$
689 estimated to the nearest hundred $=700$
$\therefore$ Required sum $=200+700=900$
Question 15
Ans. $(458+324)$
458 estimated to the nearest hundred $=500$
324 estimated to the nearest hundred $=300$
$\therefore$ Required sum $=500+300=800$
Question 16
Q.16. $(170+395)$.
Ans. $(170+395)$
170 estimated to the nearest hundred $=200$
395 estimated to the nearest hundred $=400$
$\therefore$ Required sum $=200+400=600$
Question 17
Ans. $(3280+4395)$
3280 estimated to the nearest hundred $=3300$
4395 estimated to the nearest hundred $=4400$
$\therefore$ Required sum $=3300+4400$
$\text { = } 7700$
Question 18
Ans. $(5130+1410)$
5130 estimated to the nearest hundred $=5100$
1410 estimated to the nearest hundred $=1400$
$\therefore$ Required sum $=5100+1400=6500$
Question 19
Ans. $(5130+1410)$
5130 estimated to the nearest hundred $=5100$
1410 estimated to the nearest hundred $=1400$
$\therefore$ Required sum $=5100+1400=6500$
Question 20
Q.20. (32836 + 16466).
Ans. $(32836+16466)$
32836 estimated to the nearest thousand $=33000$
16466 estimated to the nearest thousand $=16000$
$\therefore$ Required sum $=33000+16000=49000$
Question 21
Ans. $(46703+11375)$
46703 estimated to the nearest thousand $=47000$
11375 estimated to the nearest thousand $=11000$
$\therefore$ Required sum $=47000+11000=58000$
Question 22
Ans. 54 balls +79 balls
54 balls estimated to the nearest $10=50$
79 balls estimated to the nearest $10=80$
$\therefore$ Required total number of balls
$=50+80+130$
Question 23
Estimate each difference to the nearest ten :
Q.23. (53 - 18).
Ans. (53 - 18)
53 estimated to the nearest ten $=50$
18 estimated to the nearest ten $=20$
$\therefore$ Difference of 50 and $20=50-20=30$
$=260$
Question 24
Ans. $(97-38)$
97 estimated to the nearest ten $=100$
38 estimated to the nearest ten $=40$
$\therefore$ Difference of 100 and $40=100-40=60$
Question 25
Ans. (409 - 148)
409 estimated to the nearest ten $=410$
148 estimated to the nearest ten $=150$
$\therefore$ Difference of 410 and $150=410-150$
Question 26
Estimate each difference to the nearest hundred:
Q.26. (678 - 215).
Ans. $(678$ - 215)
678 estimated to the nearest hundred $=700$
215 estimated to the nearest hundred $=200$
$\therefore$ Difference between 700 and 200
$=700-200=500$
Question 27
Ans. $(957$ - 578)
957 estimated to the nearest hundred $=1000$
578 estimated to the nearest hundred $=600$
$\therefore$ Difference between 1000 and 600
$=1000-600=400$
Question 28
Ans. (7258 - 2429)
7258 estimated to the nearest hundred $=7300$
2429 estimated to the nearest hundred $=2400$
$\therefore$ Difference between 7300 and 2400
$=7300-2400=4900$
Question 29
Ans.
5612 estimated to the nearest hundred $=5600$
3095 estimated to the nearest hundred $=3100$
$\therefore$ Difference between 5600 and 3100
$=5600-3100=2500$
Question 30
Estimate each difference to the nearest thousand:
Q.30. (35863 - 27677)
Q.30. (35863 - 27677)
Ans.
35863 estimated to the nearest thousand $=36000$
27677 estimated to the nearest thousand $=28000$
$\therefore$ Difference between 36000 and 28000
$=36000-28000=8000$
Question 31
Ans. (47005 - 39488)
47005 estimated to the nearest thousand $=47000$
39488 estimated to the nearest thousand $=39000$
Difference between 47000 and 39000
$=47000-39000=8000$
15 estimated to the nearest ten $=20$
34 estimated to the nearest ten $=30$
$20 \times 30=600$ Ans.
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