Estimate each of the following using general rule Class 6

Question – Estimate each of the following using general rule Class 6:
(a) 730 + 998
(b) 796 – 314
(c) 12,904 +2,888
(d) 28,292 – 21,496

Solution –

To estimate the result of operation of two numbers, we first estimate the rounded off figures of each number, and then apply the given operation.

(a) Rounding off to hundreds
730 rounds off to = 700
998 rounds off to = 1000
Estimated sum  =  700 + 1000 = 1700

(b) Rounding off to hundreds
796 rounds off to = 800
314 rounds off to = 300
Estimated difference = 800 – 300 =  500

(c) Rounding off to thousands
12,904 rounds off to = 13,000
2,888 rounds off to = 3,000
Estimated sum = 13,000 + 3,000 = 16,000

(d) Rounding off to thousands
28,292 rounds off to = 28,000
21,496 rounds off to = 21,000
Estimated difference = 28,000 – 21,000 =  7,000

Related Questions –

• Give a rough estimate (by rounding off to nearest hundreds) and also a closer estimate (by rounding off to nearest tens)
• Estimate the following products using general rule Class 6