**New Learning Composite Mathematics SK Gupta Anubhuti Gangal Class 6 Knowing Our Numbers Practice 1F Solution**

**(1) (a) **68 nearest ten is 70

53 nearest ten is 50

∴ Estimate sum = 70 + 50

= 120

(b) 466 hundred is 500

325 hundred ten is 300

∴ Estimate sum = 500 + 300

= 800

(c) 8379 nearest hundred is 8400

264 nearest hundred is 300

Estimate sum = 8400 + 300

= 8700

(d) 1693 nearest thousand is 2000

4509 nearest thousand is 5000

Estimate sum = 2000 + 5000

= 7000

(e) 27,619 nearest ten thousand is 30,000

53, 987 nearest ten thousand is 50,000

∴ Estimate sum = 30,000 + 50,000

= 80,000.

**(2)** (a) 898 nearest hundred is 900

345 nearest hundred is 300

Estimate difference = 900 – 300

= 600

(b) 839 nearest ten is 840

48 nearest ten is 50

∴ Estimate difference = 840 – 50

= 790

(c) 362 nearest hundred is 400

279 nearest hundred is 300

Estimate difference = 400 – 300

= 100

(d) 5718 nearest thousand is 6000

2014 nearest thousand is 2000

∴ Estimate difference = 6000 – 2000

= 4000.

(e) 73,284 nearest thousand is 70,000

39,541 nearest ten thousand is 40,000

∴ Estimate difference = 70000 – 40000

= 30000

**(3)** (a) 68 nearest ten is 70

7 is not rounded off

∴ Estimated product = 70 x 7

= 490

(b) 523 nearest ten is 500

16 nearest ten is 20

∴ Estimate product = 500 x 20

10000

(c) 517 nearest ten is 500

68 nearest ten is 70

∴ Estimate product = 500 x 70

= 35,000

(d) 74 nearest ten is 70

87 nearest ten is 90

∴ Estimate product = 70 x 90

= 6300

(e) 408 nearest hundred is 400

189 nearest hundred is 200

∴ Estimate product = 400 x 200

= 80,000

**(4)** (a) 123 ÷ 8 => 120 ÷ 8 = 15

∴ Estimate quotient = 15

(b) 157 ÷ 19 => 160 ÷ 20 = 8

∴ Estimate quotient = 8

(c) 958 ÷ 49 => 1000 ÷ 50 = 20

∴ Estimate quotient = 20

(d) 7982 ÷ 1728 => 8000 ÷ 2000 = 4

∴ Estimate quotient = 4

(e) 17,869 ÷ 8,759 => 18,000 ÷ 9000 = 2

∴ Estimate quotient = 2

**(5)** (a) 7680 nearest thousand is 8000

4293 nearest thousand is 4000

∴ Estimate sum = 8000 + 4000

= 12000

(b) 58,734 nearest ten thousand is 60,000

14,695 nearest ten thousand is 10,000

∴ Estimate difference = 60,000 – 10,000

= 40,000