The document RS Aggarwal Solutions: Number System Exercise - 1E Notes | EduRev is a part of the Class 6 Course Mathematics (Maths) Class 6.

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**Q.1. Estimate each of the following products by rounding off each number to the nearest ten.****Q.1. 38 × 63.Ans. **(38 × 63)

38 estimated to the nearest ten = 40

63 estimated to the nearest ten = 60

∴ 40 × 60 = 2400**Q.2. 54 × 47.****Ans.** (54 × 47)

54 estimated to the nearest ten = 50

47 estimated to the nearest ten = 50

∴ 50 × 50 = 2500**Q.3. 28 × 63.****Ans.** (28 × 63)

28 estimated to the nearest ten = 30

63 estimated to the nearest ten = 60

∴ 30 × 60 = 1800**Q.4. 42 × 75.****Ans.** (42 × 75)

42 estimated to the nearest ten = 40

75 estimated to the nearest ten = 80

∴ 40 × 80 = 3200**Q.5. 64 × 58.****Ans.** (64 × 58)

64 estimated to the nearest ten = 60

58 estimated to the nearest ten = 60

∴ 60 × 60 = 3600**Q.6. 15 × 34.****Ans. **(15 × 34)

15 estimated to the nearest ten = 20

34 estimated to the nearest ten = 30

∴ 20 × 30 = 600**Estimate each of the following products by rounding off each number to the nearest hundred :****Q.7. 376 × 123.****Ans.** (376 × 123)

376 estimated to the nearest hundred = 400

123 estimated to the nearest hundred = 100

∴ 400 × 100 = 40000**Q.8. 264 × 147.****Ans.** (264 × 147)

264 estimated to the nearest hundred = 300

147 estimated to the nearest hundred = 100

∴ 300 × 100 = 30000**Q. 9. 423 × 158.****Ans.** (423 × 158)

423 estimated to the nearest hundred = 400

158 estimated to the nearest hundred = 200

∴ 400 × 200 = 80000**Q.10. 509 × 179.****Ans.** (509 × 179)

509 estimated to the nearest hundred = 500

179 estimated to the nearest hundred = 200

∴ 500 × 200 = 100000**Q.11. 392 × 138.****Ans.** (392 × 138)

392 estimated to the nearest hundred = 400

138 estimated to the nearest hundred = 100

∴ 400 × 100 = 40000**Q.12. 271 × 339.****Ans. **(271 × 339)

271 estimated to the nearest hundred = 300

339 estimated to the nearest hundred = 300

∴ 300 × 300 = 90000**Estimate each of the following products by rounding off the first number upwards and ****the second number downwards :****Q.13. 183 × 154.****Ans. **(183 × 154)

183 is rounded off upwards = 200

154 is rounded off downwards = 100

∴ 200 × 100 = 20000**Q.14. 267 × 146.****Ans. **(267 × 146)

267 is rounded off upwards = 300

146 is rounded off downwards = 100

∴ 300 × 100 = 30000**Q.15. 359 × 76.****Ans.** (359 × 76)

359 is rounded off upwards = 400

76 is rounded off downwards = 70

∴ 400 × 70 = 28000**Q.16. 472 × 158.****Ans.** (472 × 158)

472 is rounded off upwards = 500

158 is rounded off downwards = 100

∴ 500 × 100 = 50000**Q.17. 680 × 164.****Ans.** (680 × 164)

680 is rounded off upwards = 700

164 is rounded off downwards = 100

∴ 700 × 100 = 70000**Q.18. 255 × 350.****Ans. **(255 × 350)

255 is rounded off upwards = 300

350 is rounded off downwards = 300

∴ 300 × 300 = 90000**Estimate each of the following products by rounding off the first number downwards and the second number upwards :****Q.19. 356 × 278.****Ans. **(356 × 278)

356 is rounded off downwards = 300

278 is rounded off upwards = 300

∴ 300 × 300 = 90000**Q.20. 472 × 76.****Ans. **(472 × 76)

472 is rounded off downwards = 400

76 is rounded off upwards = 80

∴ 400 × 80 = 32000**Q.21. 578 × 369.****Ans.** (578 × 369)

578 is rounded off downwards = 500

369 is rounded off upwards = 400

∴ 500 × 400 = 200000

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