Question 17. Estimate the following products using general rule:
(a) 578x161578x161 (b) 5281x34915281x3491 (c) 1291x5921291x592 (d) 9250X299250x29
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Answer:
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Step-by-step explanation:
Estimate the following products using general rule:
(a) 578 × 161 (b) 5281 × 3491 (c) 1291 × 592 (d) 9250 × 29
Solution (a)
578 x 161
Rounding off 578 to the nearest hundreds, we get 600
And, rounding off 161 to the nearest hundreds, we get 200
Therefore, 600 x 200 = 1,20,000
It means that estimate of 578 x 161 is equal to 1,20,000 according to the general rule.
Solution (b)
5281 × 3491
Rounding off 5,291 to the nearest thousands, we get 5,000
And, rounding off 3,491 to the nearest hundreds, we get 3,500
Therefore, 5,000 x 3,500 = 1,75,00,000
It means that estimate of 5281 x 3491 is equal to 1,75,00,000 according to the general rule.
Solution (c)
1291 × 592
Rounding off 1291 to the nearest hundreds we get, 1300
And, rounding off 592 to the nearest hundreds, we get 600
Therefore, 1300 x 600 = 7,80,000
It means that estimate of 1291 x 592 is equal to 7,80,000 according to the general rule.
Solution (d)
9250 × 29
Rounding off 9250 to the nearest thousands, we get 9000
And, rounding off 29 to the nearest tens, we get 30
Therefore, 9000 x 30 = 2,70,000
It means that estimate of 9250 × 29 is equal to 2,70,000 using general rule.
Answer:
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