Mathematics
Find the approximate difference to the nearest thousand :
(i) (45,783 - 38,695)
(ii) (38,005 - 29,375)
(iii) (7,654 - 4,368)
Answer
(i) (45,783 - 38,695)
Round 45,783 to the nearest thousand: The hundreds digit is 7, so it rounds up to 46,000.
Round 38,695 to the nearest thousand: The hundreds digit is 6, so it rounds up to 39,000.
Approximate difference: 46,000 − 39,000 = 7,000
Hence, the approximate difference = 7,000.
(ii) (38,005 - 29,375)
Round 38,005 to the nearest thousand: The hundreds digit is 0, so it rounds down to 38,000.
Round 29,375 to the nearest thousand: The hundreds digit is 3, so it rounds down to 29,000.
Approximate difference: 38,000 − 29,000 = 9,000
Hence, the approximate difference = 9,000.
(iii) (7,654 - 4,368)
Round 7,654 to the nearest thousand: The hundreds digit is 6, so it rounds up to 8,000.
Round 4,368 to the nearest thousand: The hundreds digit is 3, so it rounds down to 4,000.
Approximate difference: 8,000 − 4,000 = 4,000
Hence, the approximate difference = 4,000.
Related Questions
Find the approximate difference to the nearest ten :
(i) (64 - 29)
(ii) (186 - 49)
(iii) (429 - 206)
Find the approximate difference to the nearest hundred :
(i) (769 - 435)
(ii) (859 - 675)
(iii) (8,359 - 4,317)
Estimate each of the following products by rounding off each number to the nearest ten:
(i) (49 × 72)
(ii) (39 × 62)
(iii) (63 × 57)
(iv) (35 × 43)
Estimate each of the following products by rounding off each number to the nearest hundred :
(i) 265 × 334
(ii) 457 × 872
(iii) 381 × 316
(iv) 455 × 138