(i) 67 and 44

67 to the nearest ten 70 and, 44 to the nearest ten = 40

∴ Required sum (70 + 40) = 110

(ii) 34 and 87

34 to the nearest ten = 30 and, 87 to the nearest ten = 90

∴ Required sum = (30 + 90) = 120

(iii) 23 and 66

23 to the nearest ten = 20 and, 66 to the nearest ten = 70

∴ Required sum = (20 + 70) = 90

(iv) 78 and 18

78 to the nearest ten = 80 and, 18 to the nearest ten = 20

∴ Required sum = (80 + 20) = 100

(v) 96 and 55

96 to the nearest ten = 100 and, 55 to the nearest ten = 60

∴ Required sum = (100 + 60) = 160

(vi) 76 and 62

76 to the nearest ten = 80 and, 62 to the nearest ten = 60

∴ Required sum = (80 + 60) = 140

(vii) 457 and 175

457 to the nearest ten = 460 and, 175 to the nearest ten = 180

∴ Required sum = (460 + 180) = 640

(viii) 474 and 173

474 to the nearest ten = 470 and, 173 to the nearest ten = 170

∴ Required sum = (470 + 170) = 640

(ix) 527 and 267

527 to the nearest ten = 530 and, 267 to the nearest ten = 270

∴ Required sum = (530 + 270) = 800