Exercise: 2-A
Q1: Round off (approximate) each of the following to the nearest ten :
i. 62 → Ones place: 2 → Round down → 60
ii. 265 → Ones place: 5 → Round up → 270
iii. 543 → Ones place: 3 → Round down → 540
iv. 8261 → Ones place: 1 → Round down → 8260
v. 6296 → Ones place: 6 → Round up → 6300
vi. 3998 → Ones place: 8 → Round up → 4000
vii. 72396 → Ones place: 6 → Round up → 72400
Q2: Round off (approximate) each of the following to the nearest hundred:
i. 748 → Tens place: 4 → Round down → 700
ii. 784 → Tens place: 8 → Round up → 800
iii. 2667 → Tens place: 6 → Round up → 2700
iv. 5432 → Tens place: 3 → Round down → 5400
v. 6998 → Tens place: 9 → Round up → 7000
vi. 59997 → Tens place: 9 → Round up → 60000
Q3: Round off (approximate) each of the following to the nearest thousand :
i. 6475 → Hundreds place: 4 → Round down → 6000
ii. 6732 → Hundreds place: 7 → Round up → 7000
iii. 25352 → Hundreds place: 3 → Round down → 25000
iv. 32568 → Hundreds place: 5 → Round up → 33000
v. 9948 → Hundreds place: 9 → Round up → 10000
vi. 89994 → Hundreds place: 9 → Round up → 90000
Q4: Round off (approximate):
i. 578 to the nearest ten → 580
ii. 578 to the nearest hundred → 600
iii. 4327 to the nearest thousand → 4000
iv. 32974 to the nearest ten thousand → 30000
v. 27487 to the nearest ten thousand → 30000
Q5: Round off (approximate) each of the following to the nearest ten, nearest hundred and nearest thousand.
i. 864 → Ten: 860, Hundred: 900, Thousand: 1000
ii. 1249 → Ten: 1250, Hundred: 1200, Thousand: 1000
iii. 54547 → Ten: 54550, Hundred: 54500, Thousand: 55000
iv. 68076 → Ten: 68080, Hundred: 68100, Thousand: 68000
v. 56293 → Ten: 56290, Hundred: 56300, Thousand: 56000
vi. 7293 → Ten: 7290, Hundred: 7300, Thousand: 7000
vii. 8924379 → Ten: 8924380, Hundred: 8924400, Thousand: 8924000
Q6: Approximate each of the following to the nearest ten:
i. ₹ 562 → ₹ 560
ii. 837 m → 840 m
iii. 545 cm → 550 cm
iv. ₹ 27 → ₹ 30
Q7: List all the natural numbers which can be rounded off to 30.
25, 26, 27, 28, 29, 30, 31, 32, 33, 34
Q8: List all the whole numbers which are approximate to 50.
45 to 54
Q9: Write the smallest and the largest numbers which are rounded off to 90.
85 and 94
Q10: Write the smallest and the largest numbers which are approximate to 130.
125 and 134
