Questions
Estimate each of the following using general rule:
(a) 730 + 998 (b) 796 – 314 (c) 12,904 +2,888 (d) 28,292 – 21,496
Make ten more such examples of addition, subtraction and estimation of their outcome.
detailed solution
Correct option is A
We will use " estimation in maths" to solve the given problems:
a)
Nearest round off of 730= 700
Nearest round off of 998 = 1000
Therefore,
730+ 998= 700 + 1000 = 1700
730 + 998 = 1700
b)
Nearest round off of 796= 800
Nearest round off of 314= 300
Therefore,
796- 314= 800- 300 = 500
796- 314= 500
c)
Nearest round off of 12904 = 13000
Nearest round off of 2888 = 3000
Therefore,
12,904 +2,888 = 13000 + 3000 = 16000
12,904 +2,888 = 16000
d)
Nearest round off of 28292 = 28000
Nearest round off of 21496 = 21000
Therefore,
28,292 – 21,496 = 28000- 21000 = 7000
28,292 – 21,496 = 7000
Further, ten more examples of such problem are as follows :
- 299 + 249 = 300 + 250 = 550
- 301 + 201 = 300 + 200 = 500
- 529 + 349 = 500 + 350 = 850
- 5160 - 2792 = 5000 - 3000 = 2000
- 335 + 182 = 300 + 200 = 500
- 335 - 182 = 300 - 200 = 100
- 299 - 249 = 300 - 250 = 50
- 3841 - 1450 = 4000 - 1000 = 3000
- 920 - 565 = 900 - 600 = 300
- 160 + 890 = 200 + 900 = 1100
Talk to our academic expert!
detailed solution
Correct answer is 1
We will use " estimation in maths" to solve the given problems:
a)
Nearest round off of 730= 700
Nearest round off of 998 = 1000
Therefore,
730+ 998= 700 + 1000 = 1700
730 + 998 = 1700
b)
Nearest round off of 796= 800
Nearest round off of 314= 300
Therefore,
796- 314= 800- 300 = 500
796- 314= 500
c)
Nearest round off of 12904 = 13000
Nearest round off of 2888 = 3000
Therefore,
12,904 +2,888 = 13000 + 3000 = 16000
12,904 +2,888 = 16000
d)
Nearest round off of 28292 = 28000
Nearest round off of 21496 = 21000
Therefore,
28,292 – 21,496 = 28000- 21000 = 7000
28,292 – 21,496 = 7000
Further, ten more examples of such problem are as follows :
- 299 + 249 = 300 + 250 = 550
- 301 + 201 = 300 + 200 = 500
- 529 + 349 = 500 + 350 = 850
- 5160 - 2792 = 5000 - 3000 = 2000
- 335 + 182 = 300 + 200 = 500
- 335 - 182 = 300 - 200 = 100
- 299 - 249 = 300 - 250 = 50
- 3841 - 1450 = 4000 - 1000 = 3000
- 920 - 565 = 900 - 600 = 300
- 160 + 890 = 200 + 900 = 1100
Talk to our academic expert!
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