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Estimate the following products using general rule:
(a) 578 × 161 (b) 5281 × 3491 (c) 1291 × 592 (d) 9250 × 29.
Make four more such examples

Solution:

We will be using the concept of estimation in math to solve this problem.

(a) 578 × 161
578 and 161 can be rounded off to 600 and 200
On rounding off both the numbers, we get 600 and 200
600 × 200 = 120000

(b) 5281 × 3491
5281 and 3491 can be rounded off to 5000 and 3500
On rounding off both the numbers, we get 5000 and 3500
5000 × 3500 = 17500000

(c) 1291 × 592
1291 and 592 can be rounded off to 1300 and 600
On rounding off both the numbers, we get 1300 and 600
1300 × 600 = 780000

(d) 9250 × 29
9250 and 29 can be rounded off to 9000 and 30
On rounding off both the numbers, we get 9000 and 30
9000 × 30 = 270000

Examples:
1) 123 × 41 can be approximated as 120 × 40 = 4800
2) 395 × 38 can be approximated as 400 × 40 = 16000
3) 521 × 31 can be approximated as 500 × 30 = 15000
4) 1234 × 19 can be approximated s 1200 × 20 = 24000

NCERT Solutions Class 6 Maths Chapter 1 Exercise 1.3 Question 3

Estimate the following products using general rule: (a) 578 × 161 (b) 5281 × 3491 (c) 1291 × 592 (d) 9250 × 29. Make four more such examples

Summary:

(a) 578 × 161 can be estimated as 600 × 200 = 1,20,000 (b) 5281 × 3491 can be estimated as 5000 × 3500 = 1,75,00,000 (c) 1291 × 592 can be estimated as 1300 × 600 = 7,80,000 (d) 9250 × 29 can be estimated as 9000 × 30 = 2,70,000.

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