we round oft each number to the nearest hundreds.
927 is rounded off as 900 and 376 is rounded off as 400.
Estimated product = 900 400 = 3,60,000
EXERCISE 1.5
1. Estimate the sum by rounding off the numbers to the nearest hundreds :
(i) 692 + 237
(ii) 207 + 391
(iii) 587 + 182
2. Estimate the difference by rounding off the numbers to the nearest hundreds :
(iv) 509 + 89
(i) 883 - 466
(ii) 781 - 539
(iii) 900 - 675
(iv) 629 - 485
3. Estimate the following products :
(i) 28 x 67
(ii) 79 x 192
(iii) 92 x 697
4. Estimate the following by rounding off each number to its greatest place :
(i) 877 x 725
(ii) 9 × 792
(iii) 87 ~ 221
5. Estimate the following by rounding off each to the nearest rupee :
(i) * 5.26 + 2.85 (ii) *1.78 + 6.82 (iii) 9.07 - 5.92
(iv) * 5.81 - 3 2.39 (v) * 7.67 - 2.05 (vi) 8.05 + 4.82
6. Estimate the following results:
(i) 6398 + 17928
(ii) 6893 - 789
(iii) 39 x 311
(iv) 968 * 539
EXPANDING BRACKETS
Answers
Answer
1) a) 900
b) 600
c) 800
2) d) 600
a) 400
b) 300
c) 200
d) 100
3) a) 2100
b) 1520
c) 70,000
4) a) 6,42,400
b) 8,000
Step-by-step explanation:
Exercise 1.5
1) Estimate the sum by rounding off the numbers to the nearest hundred:
a) 692+237=
692=700 ; 237=200=
ans: 900
b) 207+391=
207=200; 391=400=
ans: 600
c) 587+182=
587=600; 182=200=
ans: 800
2) Estimate the difference by rounding off the numbers to the nearest hundreds:
d) 509+89=
509=500; 89=100=
ans: 600
a) 883-466=
883=900; 466=500=
ans: 200
b) 781-539=
781=800; 539=500=
ans: 300
c) 900-675 =
900=900; 675=700
ans:200
d) 629-485=
629=600; 485=500=
ans:100
3) Estimate the following products:
a) 28×67=
28=30; 67=70=
ans:2100
b) 79×192=
79=80; 192=190
ans:1520
c) 92×697=
92=90; 697=700=
ans:70,000
4) Estimate the following by rounding off each number to its greatest place
while A answer is greatest
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Answer:
39 x 311 what is ans